CN2152252Y

CN2152252Y - Electronic article-finding and defending device

Info

Publication number: CN2152252Y
Application number: CN 93238080
Authority: CN
Inventors: 钱卫东
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-01-19
Filing date: 1993-01-19
Publication date: 1994-01-05
Anticipated expiration: 2003-01-19

Abstract

The utility model discloses a practical electronic article-finding and defending device, which is composed of an interrogator and a responder. The interrogator is mastered by an owner, and the responder is attached to a predetermined article. The interrogator is composed of a radio-frequency oscillator, a highly active circuit, a frequency mixing circuit, an intermediate frequency amplification circuit, a detection circuit, a DC amplification circuit and a pressure control audio oscillator. The radio-frequency oscillator sends out an electromagnetic interrogation signal whose frequency is f< 1 >. The responder is composed of a resonant tanic, a rectifier filtering circuit and the radio-frequency oscillator. The resonance of the resonant tanic is on the f< 1 >, after rectification and filtering, electromagnetic wave energy energizes a capacitor which is used as a working power supply, and the radio-frequency oscillator sends out an answer signal whose frequency is f< 2 >. Because a battery is not adopted in the responder, the utility model can be made in small size.

Description

Electronic article-finding and defending device

The utility model relates to a kind of electronic product, particularly a kind of compact electronic device that relies on electromagnetic wave to transmit and receive to look for something in closely.

Daemon with class of electronic devices like having now recently is made of sender and reception two parts, sender partly is furnished with power supply, be installed on the slated items, continuous launching electromagnetic wave, the reception part by frequency conversion, in put, detection, directly put, voltage-controlled audio frequency swings and loudspeaker constitutes.When reception part ceaselessly received the electromagnetic wave that the sender on the slated items partly sends, loudspeaker is sounding not, in case and the distance between sending and receiving news two parts is drawn back loudspeaker sounding after the certain limit, to master alarm.Sender partly is a radio-frequency oscillator, because of being furnished with power supply, so volume is bigger, limited by battery capacity, and changes the battery trouble, and the practical application of this class of electronic devices is restricted.

Given this, the purpose of this utility model is that a kind of electronics of design is looked for something, daemon, and response part need not used power supply, makes its volume very little, thereby can be attached on the body of being looked for something, and removes trouble and the inconvenience of changing battery simultaneously from.

The utility model is made of the interrogator and the transponder that separate, and interrogator is divided into the interrogating signal issue unit, answer signal receiving element and answer signal analysis and processing unit; Transponder is divided into the interrogating signal receiving element and answer signal is beamed back the unit, it is characterized in that the interrogating signal issue unit is the radio-frequency oscillator of a band emitting antenna, the answer signal receiving element by the height that is linked in sequence put, mixing, in put, detecting circuit constitutes, High Amplifier Circuit is connected to a receiving antenna, the answer signal analysis and processing unit is made of dc amplification circuit and voltage-controlled audio frequency oscillator, rectified signal is sent into dc amplification circuit, direct current amplifies output signal and sends into voltage-controlled audio frequency oscillator, and voltage-controlled audio frequency oscillator links to each other with luminescent device with loudspeaker; The interrogating signal receiving element is a passive electric circuit, and by the resonant circuit that is linked in sequence, current rectifying and wave filtering circuit constitutes, and answer signal is beamed back the unit and is made of radio-frequency oscillator, and resonant circuit links to each other with a receiving antenna, and radio-frequency oscillator links to each other with an emitting antenna.Interrogator is grasped in user's hand, when seeking slated items, the radio-frequency oscillator of its interrogating signal issue unit sends interrogating signal f1, be attached to by the transponder on the product of looking for something the interrogating signal that receives is produced resonance, and after rectification, filtering in transponder radio-frequency oscillator working power is provided, answer signal f2 is sent through emitting antenna by radio-frequency oscillator.Answer signal receiving element in the interrogator receives answer signal after height is put, mixing, in put, detection, directly put with audio oscillator circuit after send sound equipment by loudspeaker.The person of looking for something can judge by the distance of the product of looking for something according to the luminous intensity of the luminescent device on sound equipment power and the answer signal analysis and processing unit.

This electronics is looked for something, daemon can also connect a phase inverter and selector switch between direct current amplifier and audio frequency oscillator, promptly can be used as the equipment of guarding of carrying article such as case and bag when going out and uses.

In order to make the transponder volume as far as possible little, be not subjected to the restriction in battery volume and life-span, the utility model is designed to passive electric circuit with it, utilizes the working power of interrogating signal as self, thereby dwindled volume greatly, the defective that the volume of having avoided being subjected to battery volume limitation and having caused is big, need often to change battery realizes asking and just answers, and pays no attention to and does not answer, the idle state of no signal, it is small and exquisite that product is had, practicality, outstanding easily advantage.Except that doing to seek, guard the slated items, if circuit is changed a little, as the detecting circuit in the answer signal receiving element being changed into frequency-discriminating circuit, changing direct current amplifier in the answer signal analysis and processing unit and audio frequency oscillator into note amplifier, and in transponder, increase the electron device to influence the radio-frequency oscillator parameter of oscillation, as changing C36 or C37 into electrostatic microphone, then the utility model promptly becomes a kind of miniature interception device of not charged source.In like manner, can also derive the electronic equipment that can be used for remote measurement remote sensing aspect.

Introduce the utility model in detail below in conjunction with accompanying drawing:

Fig. 1 electronics is looked for something, daemon electricity theory diagram

Fig. 2 interrogator circuitry figure

Fig. 3 transponder circuit figure I

Fig. 4 transponder circuit figure II

The actual use of Fig. 5 synoptic diagram.

The interrogating signal issue unit is a radio-frequency oscillator, constitutes self-excitation push-pull type oscillatory circuit by BG1, BG2.

Reply that receiving element has comprised that height is put, mixing, in put, detection four parts, Fig. 2 has provided a more common receiver transmission line, BG3 constitutes local oscillator, BG4 is that height is put, BG5 mixing, BG6, BG7 are put in constituting, D1 constitutes detecting circuit.

The answer signal analysis and processing unit is to be combined by direct current amplifier and voltage-controlled audio frequency oscillator.BG3, BG9, BG10 form direct current amplifier, and BG10, BG11, BG12 form voltage controlled oscillator.

The interrogating signal receiving element is made up of resonant tank, current rectifying and wave filtering circuit, L3 and C33 resonance are in interrogation signal frequency f1, when receiving enough strong inquiry electromagnetic wave signal, after D4, D5 full-wave rectification to C34 charging (strobing simultaneously), C34 is equivalent to a battery, to the radio-frequency oscillator power supply that elements such as BG13 constitute, radio-frequency oscillator produce and launch frequency by crystal JT stable reply electromagnetic wave f2.

When the answer signal receiving element of interrogator receives answer signal, through high frequency, amplification, mixing, in put and detection after, on variable resistor Rw, produce pressure drop, BG8 conducting situation is pressure drop size decision (pressure drop is big more, and the BG8 conducting is dark more) thus.Double-pole throw switch K is " function selecting " switch among the figure, and shown position is " searching " state; The conducting situation of BG8 directly influences the conducting situation of BG10 again, thereby changed the size of the audio oscillator signal intensity that audio frequency oscillator that BG11, BG12 form produces and the height of frequency (tone), changed the luminous intensity of the light emitting diode D3 that the BG10 emitter is connected in series simultaneously.By having or not of sound and optic signal, just, strong and weak, intuitively reflect received answer signal have or not and strong and weak.When receiver was not received the answer signal of certain intensity, the pressure drop deficiency of Rw was so that the BG8 conducting, so BG10 ends, D3 is not luminous, and loudspeaker is noiseless.When looking for something, when receiver was received the answer signal of certain intensity, the loudspeaker sounding was convenient to owner and is looked for something in closely.When functional select switch K places " guarding " shelves, between BG8 and BG10, added the BG9 of an inverting function, the working condition of the voltage controlled oscillator that BG10, BG11, BG12 constitute is just with aforementioned opposite, when promptly receiving answer signal, D3 does not work, and y does not ring, during the no response signal, BG8 ends, and the BG9 conducting causes the BG10 conducting, BG11, BG12 vibration, D3 is bright, and loudspeaker rings, and sends alarm call.This state is and guards the article of carrying such as case and bag when going out.

The physical circuit of transponder can be simplified to the form of Fig. 4 on the basis of Fig. 3, it utilizes the rectified action of self PN junction of strength pipe BG14, makes the C39 charging.Be equivalent to after C39 is recharged be added on the radio-frequency oscillator into battery, making it produce frequency is the electromagnetic wave signal of replying of f2.

Claims

1, electronics is looked for something, daemon, constitute by the interrogator and the transponder that separate, interrogator is divided into the interrogating signal issue unit, answer signal receiving element and answer signal analysis and processing unit, transponder is divided into the interrogating signal receiving element and answer signal is beamed back the unit, it is characterized in that the interrogating signal issue unit is the radio-frequency oscillator of a band emitting antenna, the answer signal receiving element is put by the height that is linked in sequence, mixing, in put, detecting circuit constitutes, High Amplifier Circuit is connected to a receiving antenna, the answer signal analysis and processing unit is swung device by dc amplification circuit and voltage-controlled audio frequency and is constituted, rectified signal is sent into dc amplification circuit, direct current amplifies output signal and sends into voltage-controlled audio frequency oscillator, and voltage-controlled audio frequency oscillator links to each other with luminescent device with loudspeaker; The interrogating signal receiving element is a passive electric circuit, is made of the resonant circuit that is linked in sequence, current rectifying and wave filtering circuit and radio-frequency oscillator, and resonant circuit links to each other with a receiving antenna, and radio-frequency oscillator links to each other with an emitting antenna.

2, electronics as claimed in claim 1 look for something, daemon, it is characterized in that the answer signal analysis and processing unit is made of note amplifier, the answer signal receiving element by the height that is linked in sequence put, mixing, in put with frequency discriminator and constitute, wherein, the LC shunt-resonant circuit that is tuned in interrogation signal frequency is by inductance and electrostatic microphone and connect and form.