CN2299347Y

CN2299347Y - Anti-theft device

Info

Publication number: CN2299347Y
Application number: CN 97203423
Authority: CN
Inventors: 黄德祥
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-04-15
Filing date: 1997-04-15
Publication date: 1998-12-02
Anticipated expiration: 2007-04-15

Abstract

The utility model relates to an anti-theft device, comprising a cipher generator, a single or a plurality of cipher receivers, a transmitter, and a single or a plurality of alarms. The cipher generator is arranged on the transmitter. The cipher receivers are arranged on the alarms. The cipher generator can transmit on-off signals and on-off ciphers to the cipher receivers; after the correctness of the on-off ciphers is compared with the cipher receivers, the anti-theft device is opened or closed according to the on-off signals; when the anti-theft device is opened, the transmitter continuously transmits signals to the alarms; when the alarms do not receive the signals, an alarm is started to send out an alarm; when the alarm function of the alarms is removed, close signals and the on-off ciphers must be transmitted by the transmitter to close the alarms.

Description

Anti-theft device

The utility model relates to a kind of anti-theft device, is particularly useful for preventing user's the stolen anti-theft device of belongings.

Known anti-theft device has a transmitter and a warning horn, transmitter can be carried by the user, warning horn is provided with the switch of hummer and control warning horn, and in the time that transmitter and warning horn distance to each other surpass the safe distance of original setting, then warning horn sounds the alarm; Its defective is the switch of the control warning horn on the warning horn, and the burglar can directly start the control warning horn switch on the warning horn, stops hummer to send sound, and commits theft under unwitting situation in the user.

The warning horn that the purpose of this utility model is to overcome known anti-theft device has the defective of control warning horn power switch, and changes with the open and close by the cipher control warning horn, makes the burglar directly close warning horn and commits theft.

The anti-theft device that the utility model provides comprises at least one password generator, at least one password receiver, a transmitter and at least one warning horn.Transmitter can be carried by the user, controls the warning horn power switch and have the high-decibel hummer on the warning horn but be not provided with, and this warning horn can be arranged on the article that avoid theft.When desire is opened or closed anti-theft device, need earlier the switch signal set with the transmission of password generator when correct, can move according to the indication of switch signal with the switch password; When anti-theft device begins the action warning, transmitter can continue with radio wave transmission code signal to warning horn, and when to each other hypertelorism of transmitter and warning horn, when promptly warning horn can't be received the code signal that transmitter sends, sound will take place hummer warned.

The anti-theft device that the utility model provides comprises:

At least one password generator, this password generator comprises a starting switch, a switch signal generating circuit, a transmission interface and a switch cryptochannel, starting switch comprises a start switch and a shut down switch, the switch signal that produces reaches the switch signal generating circuit, the switch cryptochannel is with switch password input switch signal generating circuit, and the switch signal generating circuit reaches transmission interface with switch signal and switch password;

At least one password receiver, comprise that one receives interface, a switch signal receiving circuit and a switch password identification circuit, receive interface and receive switch signal and the switch password that transmits by transmission interface, and reach switch signal receiving circuit and switch password identification circuit, switch signal receiving circuit and switch password identification circuit are confirmed and comparison switch signal and switch password respectively, if switch signal and switch password are errorless through confirming comparison, then move according to the indication of switch signal;

One transmitter, comprise a coding and modulation circuit, a radio-frequency transmissions circuit and one first antenna, the coding and modulation circuit with code signal coding and modulation after, be sent to the radio-frequency transmissions circuit, the code signal that the radio-frequency transmissions circuit will be encoded and modulation circuit sends is treated to high-frequency signals, is launched by first antenna again; And

At least one warning horn, comprise one second antenna, one radio-frequency (RF) receiving circuit, one demodulation and decoding circuit, one delay control circuit, one hummer and a power control circuit, whether the execution alarm function of power control circuit control warning horn, second antenna can receive the code signal of being launched by first antenna, and reach radio-frequency (RF) receiving circuit, radio-frequency (RF) receiving circuit can receive the extraneous high-frequency electric wave signal that is received by second antenna, reach demodulation and decoding circuit again to carry out demodulation and decoding comparison code signal, if the code signal is correct, then transmit and receive that signal is to delay control circuit, delay control circuit is in the time of setting, do not receive the signal of receiving by demodulation and decoding circuit transmission yet, the hummer that promptly moves is warned.

Described password generator can be arranged on transmitter or the warning horn, and the password receiver can be arranged on relative password the generator set transmitter or warning horn.

The described password generator on the warning horn or the quantity of password receiver of being arranged at is equal to the quantity of warning horn.

Can set up a pilot lamp in power control circuit, pilot lamp is a light-emittingdiode, and power control circuit starts or closes and is conducting constantly synchronously or is open-circuit condition.

Described transmission interface with receive mode that interface directly plugs together with terminal to each other and transmit and receive signal.

Described transmitter also can comprise a timing control circuit, and when timing control circuit control coding and modulation circuit launch signal to the radio-frequency transmissions circuit.

Described password generator can be independently unit, is not arranged in the same unit with transmitter or warning horn.

The password receiver can be independently unit, is not arranged in the same unit with transmitter or warning horn.

Further describe the utility model below in conjunction with accompanying drawing:

Fig. 1: be structure calcspar of the present utility model.

Fig. 2: be the utility model circuit diagram.

Fig. 3: for the utility model starts and closes the anti-theft device process flow diagram.

Wherein:

Anti-theft device 10 password generators 20

Starting switch 21 start switches 211

Shut down switch 212 switch signal generating circuits 22

Transmission interface 23 switch cryptochannels 24

First battery, 25 password receivers 30

Receive interface 31 switch signal receiving circuits 32

Switch password identification circuit 33 transmitters 40

Timing control circuit 41 coding and modulation circuits 42

Radio-frequency transmissions circuit 43 first antennas 44

Warning horn 50 second antennas 51

Radio-frequency (RF) receiving circuit 52 demodulation and decoding circuit 53

Delay control circuit 54 hummers 55

Second battery, 56 power control circuits 60

Pilot lamp 70 Q1:PNP electric crystals

Q2:NPN electric crystal R1-R4: resistance

The detailed description of preferred embodiment:

See also Fig. 1.The anti-theft device 10 that present embodiment provides mainly comprises a password generator 20, a password receiver 30, a transmitter 40 and a warning horn 50.

See also Fig. 2, password generator 20 comprises a starting switch 21, a switch signal generating circuit 22, a transmission interface 23 and a switch cryptochannel 24; And password generator 20 is arranged on the transmitter 40.

Starting switch 21 comprises a start switch 211 and a shut down switch 212, can produce the switch signal of open and close respectively, and the switch signal is reached switch signal generating circuit 22.

Switch cryptochannel 24 can then adopt SW DIP-8 (general electronic component) in an embodiment with switch password input switch signal generating circuit 22.

Switch signal generating circuit 22 can reach transmission interface 23 again with switch signal and the switch password that is transmitted by starting switch 21 and switch cryptochannel 24, then adopts in an embodiment and closes safe semi-conductive HT-12E product.

Transmitter 40 comprises a timing control circuit 41, coding and modulation circuit 42, a radio-frequency transmissions circuit 43 and one first antenna 44.

Below described be the manner of execution of present embodiment transmitter 40:

The former code signals that are set with in coding and the modulation circuit 42, coding and modulation circuit 42 can be with the code signals behind the encoded and modulation, after reaching radio-frequency transmissions circuit 43 and being treated to high-frequency signals again, launched by first antenna 44; Because of coding, modulation and emitting radio wave signal are all known technology, do not give unnecessary details so do not add.

Timing control circuit 41 can regularly be controlled coding by the time of setting and modulation circuit 42 is launched the time of signals to radio-frequency transmissions circuit 43, and for example signal of emission in per 0.8 second is given warning horn.

Password receiver 30 comprises that one receives interface 31, a switch signal receiving circuit 32 and a switch password identification circuit 33; And password receiver 30 is arranged on the warning horn 50.

Warning horn 50 comprises one second antenna 51, a radio-frequency (RF) receiving circuit 52, a demodulation and decoding circuit 53, a delay control circuit 54, a hummer 55 and power control circuit 60.

For the anti-theft device 10 of understanding present embodiment starts and closing flow path figure, see also Fig. 2 and Fig. 3.Receive the modes that interface 31 can directly engage with terminal mutually with transmission interface 23, reception reaches switch signal receiving circuit 32 and switch password identification circuit 33 again by switch signal and switch password that transmission interface 23 transmits.

Switch signal receiving circuit 32 can be confirmed and comparison the switch signal and the switch password that are transmitted by reception interface 31 respectively with switch password identification circuit 33, after affirmation and comparison, if when identical with the switch password with the switch signal of original setting, then the switch signal is reached power control circuit 60, to open or powered-down control circuit 60, see also Fig. 2; Wherein, the switch signal receiver in the present embodiment adopts and closes safe semi-conductive HT-12D and SW DIP-8 (SW DIP-8 is the universal electric part).

Power control circuit 60 may command enter the power supply of radio-frequency (RF) receiving circuit 52, demodulation and decoding circuit 53, delay control circuit 54 and hummer 55; Wherein, power control circuit 60 can be made up of a PNP electric crystal Q1, a NPN electric crystal Q2 and a resistance R 2, as a power switch.

Below describedly be warning horn 50 manner of execution in the present embodiment: second antenna 51 can receive the code signal of being launched by first antenna 44, and the code signal is reached radio-frequency (RF) receiving circuit 52 reaches demodulation and decoding circuit 53 again.

The high-frequency electric wave signal that demodulation and decoding circuit 53 import radio-frequency (RF) receiving circuit 52 into is demodulated into low-frequency signal, and decoding and comparison code signal, if the code signal is identical with the code signal of former setting, then transmits this and receives that signal is to delay control circuit 54; Because radio-frequency (RF) receiving circuit 52, demodulation and decoding circuit 53 are all known circuits with delay control circuit 54, so repeat no more.

Delay control circuit 54 can be set a time delay, as two seconds, if in this time, is not received from demodulation and decoding circuit 53 in promptly two seconds yet and transmits the signal of receiving that comes, moves hummer 55 at once, with the announcement of warning.

In addition, present embodiment is in power control circuit 60, can set up a pilot lamp 70, this pilot lamp 70 is a light-emittingdiode, conducting simultaneously in the time of can starting with power control circuit 60, be open-circuit condition when power control circuit is closed warning horn 50 simultaneously, an indication can be provided, before committing theft, can have the function that the resistance of in advance frightening makes its thought of giving up committing theft the burglar who desires to commit theft.

In sum, anti-theft device of the present utility model as can be known is not provided with the power switch of control warning horn on warning horn, so the burglar can't be directly by powered-down on the warning horn; And by password generator and password receiver after comparison of switch password and identification, can open or close anti-theft device; And anti-theft device also can flexibly adopt the mode of a transmitter to a plurality of warning horns; In addition, the former setting in the code signal of coding and modulation circuit also can be provided by other circuit, even can be provided by the switch password of switch cryptochannel and the identical password of alternative use.So can reach antitheft purpose by disclosed structure really, have progressive and practicality.If adopts the password generator is arranged at warning horn, and the password receiver is arranged at the mode of transmitter; Or password generator and password receiver be all independently unit, and be not arranged in the same unit with transmitter or warning horn; Do not break away from scope of the present utility model yet.

Claims

1. anti-theft device, comprise: a transmitter, comprise a coding and modulation circuit, a radio-frequency transmissions circuit and one first antenna, the coding and modulation circuit with code signal coding and modulation after, be sent to the radio-frequency transmissions circuit, the code signal that the radio-frequency transmissions circuit will be encoded and modulation circuit sends is treated to high-frequency signals, is launched by first antenna again; And

At least one warning horn, comprise one second antenna, one radio-frequency (RF) receiving circuit, one demodulation and decoding circuit, one delay control circuit, one hummer and a power control circuit, whether the execution alarm function of power control circuit may command warning horn, second antenna can receive the code signal of being launched by first antenna, and reach radio-frequency (RF) receiving circuit, radio-frequency (RF) receiving circuit can receive the extraneous high-frequency electric wave signal that is received by second antenna, reach demodulation and decoding circuit again to carry out demodulation and decoding comparison code signal, if the code signal is correct, then transmit and receive that signal is to delay control circuit, delay control circuit is in the time of setting, do not receive the signal of receiving by demodulation and decoding circuit transmission yet, the hummer that promptly moves is warned;

It is characterized in that also comprising: at least one password generator, this password generator comprises a starting switch, a switch signal generating circuit, a transmission interface and a switch cryptochannel, starting switch comprises a start switch and a shut down switch, the switch signal that produces is reached the switch signal generating circuit, the switch cryptochannel is with switch password input switch signal generating circuit, and the switch signal generating circuit reaches transmission interface with switch signal and switch password;

At least one password receiver, comprise that one receives interface, a switch signal receiving circuit and a switch password identification circuit, receive interface and receive switch signal and the switch password that transmits by transmission interface, and reach switch signal receiving circuit and switch password identification circuit, switch signal receiving circuit and switch password identification circuit are confirmed and comparison switch signal and switch password respectively, if switch signal and switch password are errorless through confirming comparison, then move according to the indication of switch signal.

2. by the described anti-theft device of claim 1, it is characterized in that described password generator can be arranged at transmitter or warning horn, and the password receiver can be arranged at relative password generator set transmitter or warning horn.

3. by the described anti-theft device of claim 1, it is characterized in that the described password generator on the warning horn or the quantity of password receiver of being arranged at, be equal to the quantity of warning horn.

4. by the described anti-theft device of claim 1, it is characterized in that and can set up a pilot lamp in power control circuit that pilot lamp is a light-emittingdiode, power control circuit starts or closes and is conducting constantly synchronously or is open-circuit condition.

5. by the described anti-theft device of claim 1, it is characterized in that described transmission interface and receive interface and transmit for the mode that directly plugs together with terminal to each other and receive signal.

6. by the described anti-theft device of claim 1, it is characterized in that described transmitter also can comprise a timing control circuit, when timing control circuit control coding and modulation circuit launch signal to the radio-frequency transmissions circuit.

7. by the described anti-theft device of claim 1, it is characterized in that described password generator can be independently unit, is not arranged in the same unit with transmitter or warning horn.

8. by the described anti-theft device of claim 1, it is characterized in that described password receiver can be independently unit, is not arranged in the same unit with transmitter or warning horn.