CN2142213Y - Radio automatic burglar alarm - Google Patents
Radio automatic burglar alarm Download PDFInfo
- Publication number
- CN2142213Y CN2142213Y CN 92218406 CN92218406U CN2142213Y CN 2142213 Y CN2142213 Y CN 2142213Y CN 92218406 CN92218406 CN 92218406 CN 92218406 U CN92218406 U CN 92218406U CN 2142213 Y CN2142213 Y CN 2142213Y
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- China
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- utility
- model
- antenna
- radio
- potentiometer
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a radio automatic burglar alarm. The utility model comprises a transmitting component and a receiving component which are divided; the utility model can transmit the signals without modulation, just using the amplitude sizes of the constant amplitude carrier and the distance of the receiving component and the transmitting component; the post-detecting direct current signal can be amplified to control the state of the audio oscillation to oscillate or not; a potentiometer which can determine the voltage bias is used for adjusting the rated distance. Compared with the existing scheme, the utility model can obviously reduce the cost and improve the reliability; a small transmitting component is put in a tested bag; when the bag is stolen and is taken away beyond the rated distance, the receiving component in the pocket can send alarm automatically.
Description
The utility model relates to a kind of wireless alarm, and the Antistealing that is mainly used in carry-on handbag belongings is reported to the police.
People's Republic of China's utility model patent " portable security alarm anti-lose alarm ", application number 91212209.9, notification number CN2091009U, applying date 91.2.11, day for announcing 91.12.18, it can overcome some shortcomings that Huiyang, Guangdong Electronic Instruments Plant 90 produces " anti-lose alarm " per year, but popularization and application far away.One of them major reason is that cost is higher.The information that this alarm needs only is the distance between the sending and receiving assembly, and modulation is unnecessary, utilizes the amplitude information of the constant-amplitude carrier that depends on sending and receiving inter-module distance just passable.Therefore exist the possibility that reduces cost significantly from system schema.
The purpose of this utility model is to overcome the former shortcoming, and system schema is tending towards rationally, and a kind of cheap and good-quality Antistealing alarm can be provided, and reaches the effect of popularization and application.
The purpose of this utility model is achieved in that emitting module is made up of radio-frequency oscillator and antenna, and it does not add any modulation circuit, a transmitting carrier frequency; Receiving unit is by antenna, radio frequency amplifier, wave detector, direct current amplifier, audio frequency oscillator, audio-frequency power amplifier and loudspeaker are formed, the transmitting carrier frequency signal that wave detector will amplify becomes direct current signal, direct current amplifier provides certain gain, and played inverting function, when receiving CF signal, directly put output low level, force the audio oscillation failure of oscillation, loudspeaker is sounding not, and when can not receive CF signal, directly put the output high level, audio oscillation starting of oscillation, loudspeaker sounding alarm, that is to say, the amplitude size of whether reporting to the police and depending on constant-amplitude carrier, this amplitude size depends on receipts, send out the inter-module distance, thereby can play stolen effect of reporting to the police automatically; Adopt the bias voltage of potentiometer change direct current amplifier, so that adjust specified coverage.If small-sized emitting module is put into your handbag, in case stolen, handbag surpasses nominal distance from body, and the receiving unit in your pocket will send chimes of doom automatically.
By such scheme as can be known, the component part of this system all is to realize that this Antistealing warning function is necessary, and it has saved modem section unnecessary in the existing scheme, has reduced cost significantly, has improved reliability (null modem fault).Some have the wireless alarm or the remote-control toy of local analogy, though radiating portion does not have modulation yet, what receiving unit was used is superregenerative detection, utilize the carrier wave noise that disinthibites, and its performance or functional price are than not as this programme height.
Below in conjunction with drawings and Examples this programme is described further.
Fig. 1 is the emitting module electrical schematic diagram of embodiment 1.
Fig. 2 is the receiving unit electrical schematic diagram of embodiment 1.
Fig. 1 is 3 inductance type radio-frequency oscillators, and electromagnetic wave is launched by antenna.
Among Fig. 2, a is the radio frequency amplifier stage, and the CF signal that the emitting module that the antenna reception is come sends is amplified.B is detection and direct current amplifier stage, and the detection of diode multiplication of voltage becomes CF signal into direct current signal.Potentiometer among the figure, is adjusted it and just can be adjusted specified coverage as the reference bias voltage of directly putting pipe from the power supply dividing potential drop, because directly put the reference bias that output depends on that simultaneously the direct current signal that detects and potentiometer determine.Another effect of potentiometer is the influence of offsetting environmental change, for example because the variation significantly of environment temperature, the corresponding different nominal distance of same position potentiometer possibility, as long as adjust potentiometer a little, system just can be issued to same specified coverage in different temperature.C is audio oscillation and audible segment among Fig. 2, and the audio frequency oscillator bias voltage is subjected to directly to put the control of output, so whether the starting of oscillation of audio oscillation also is subjected to the control of directly putting.The emitter follower of back plays the effect of impedance matching, has power amplification.The loudspeaker that sends chimes of doom adopts the electromagnetic type sounding body, and volume is little, efficient is high.
The utility model emitting module adopts plastic casing, is power supply with the battery, turns on the power switch, and pilot lamp is bright, shows that emitting module is in work.Receiving unit is also used plastic casing, is power supply with the battery equally, turns on the power switch, and pilot lamp is bright.It (is nominal distance that distance between emitting module and the receiving unit is put into your distance of needs, be equal to or greater than this distance, will report to the police automatically), adjust potentiometer make " just " on this distance the receiving unit warning (meaning of " just " is this position from potentiometer, be transferred to an end continuously chimes of doom is arranged always, and from this position, be transferred to the other end in the other direction continuously, never have chimes of doom), at this moment emitting module is put into your handbag (nonmetal bag), receiving unit is put into your pocket or is tied up on the waistband, and this warning system has just begun normally to bring into play Antistealing warning effect.
Adopt the solution of the present invention, the part element circuit can be used various universal circuits, so embodiment is diversified.Lift an example below again.
In the receiving unit, radio frequency amplifier adopts the two-stage cascade amplifier, can reduce the requirement to radio frequency amplifier tube parameter.The power amplifier of audio frequency oscillator and back can adopt double-tone, multi-harmonic-oscillations formula call circuit, to improve the warning sense of hearing.Other element circuit can be with embodiment 1.
Claims (3)
1, a kind of wireless automatic burglar alarm is made of emitting module that separates and receiving unit, it is characterized in that: emitting module comprises radio-frequency oscillator and antenna; Receiving unit is connected to antenna, radio frequency amplifier, wave detector, direct current amplifier and call circuit in order, wherein directly puts biasing circuit and contains a potentiometer.
2, alarm according to claim 1 is characterized in that emitting module is made of plastic casing, switch, pilot lamp, antenna and the radio-frequency oscillator and the battery that are installed in the shell.
3, alarm according to claim 1 is characterized in that receiving unit is regulated with potentiometer, antenna and the radio frequency amplifier, wave detector, direct current amplifier, audio frequency oscillator, audio-frequency power amplifier, loudspeaker and the battery that are installed in the shell by plastic casing, switch, pilot lamp, nominal distance to constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92218406 CN2142213Y (en) | 1992-07-19 | 1992-07-19 | Radio automatic burglar alarm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92218406 CN2142213Y (en) | 1992-07-19 | 1992-07-19 | Radio automatic burglar alarm |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2142213Y true CN2142213Y (en) | 1993-09-15 |
Family
ID=33765939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92218406 Expired - Fee Related CN2142213Y (en) | 1992-07-19 | 1992-07-19 | Radio automatic burglar alarm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2142213Y (en) |
-
1992
- 1992-07-19 CN CN 92218406 patent/CN2142213Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |