CN2201817Y

CN2201817Y - Theft-proof wallet

Info

Publication number: CN2201817Y
Application number: CN 94237199
Authority: CN
Inventors: 胡有礼; 贺定一
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-23
Filing date: 1994-04-23
Publication date: 1995-06-28
Anticipated expiration: 2004-04-23

Abstract

The utility model relates to a theft-proof wallet, which is characterized in that the surface of a wallet body is produced with two groups of metallic layers which are insulated with each other, or the surface of the wallet body and a printed circuit board are respectively produced with metallic layers to form an inductive transducer. An alarm device fixed in the sandwich layer of the wallet body is composed of an oscillator, an emitter follower, a switch circuit and an alarm sound circuit. The switch circuit and the alarm sound circuit do not work at normal service life. When human hands approach to and need not to contact the wallet body, the distribution capacity of the inductive transducer used as one of oscillation circuit elements of the oscillator is changed, and the alarm sound circuit is driven to send out alarm immediately. The utility model has the advantages of good theft-proof effect and economical and practical performance.

Description

Theft-proof wallet

The utility model relates to a kind of wallet of personal belongings, particularly a kind of novel thief-proof wallet.

The most light-sensitive elements that adopt of wallet that have the thief-proof function of electronic warning in the prior art are as sensor, have only wallet taken out and could report to the police after pocket is seen light, still can not report to the police weak effect even wallet is taken out pocket as making it lucifuge; Some products that can report to the police when staff touches the wallet surface conductor have also appearred, " thief-proof wallet " (87205939) as the Chinese patent bulletin, it is at the full conductor as electrode of wallet outer surface seal, in case just can report to the police when staff touches the wallet surface, but then can not report to the police when the hand of putting on insulating glove touches, burglar-proof result is still undesirable.

The purpose of this utility model be to overcome above-mentioned weak point and provide a kind of as long as human body hand near and need not touch can report to the police, novel thief-proof wallet that burglar-proof result is good.

Novel thief-proof wallet of the present utility model comprises inclusion, it is characterized in that it also has the warning device of being made up of inductosyn, oscillator, emitter follower, on-off circuit and chimes of doom circuit.During normal the use, oscillator output end is an electronegative potential, emitter follower is in cut-off state, on-off circuit, chimes of doom circuit are not worked, when human body hand during near inclusion, inductosyn distribution capacity as one of oscillator tank element changes, the frequency of oscillation of oscillator changes thereupon, because the effect of backfeed loop, the current potential increment of oscillator output end is input to on-off circuit by emitter follower and makes it the switching tube saturation conduction, thereby connects the chimes of doom circuit power and send chimes of doom.After each electronic component welds, printed circuit board is fixed in the inclusion interlayer, inductosyn is then by the metal level that is produced on the two groups of mutually insulateds in inclusion surface or make metal level respectively constitute on inclusion surface, printed circuit board.

Fig. 1 is the utility model structural representation;

Fig. 2 is a warning device electricity theory diagram;

Fig. 3 is the warning device circuit diagram;

Fig. 4 is a printed circuit board.

Now illustrated embodiment is made detailed description to the utility model in conjunction with the accompanying drawings.

The inductosyn I of warning device is made of the metallic plate on wire netting that is produced on the inclusion surface and the printed circuit board, and distribution capacity is C ₀, an end ground connection wherein.The oscillator II is with oscillating crystal triode BG ₁Be core composition, wherein BG ₁Base stage and connecting resistance R ₁, R ₂, quartz crystal H an end, R ₁The other end connects crystal diode D ₁Negative pole, resistance R ₃, R ₄An end, BG ₁Emitter stage, R ₂The other end, D ₁Anodal also ground connection, BG ₁Colelctor electrode also meets R ₃The other end, capacitor C ₂, C ₆, inductance L ₁, resistance R ₅One end, C ₂The other end and capacitor C ₃One end and ground connection, C ₃The other end connects the H other end, capacitor C ₄, C ₅, adjustable resistance R ₆One end, C ₄, C ₅, L ₁The other end also meets R ₆The other end connects C ₀Another group.The emitter follower III is with transistor BG ₂Be core composition, wherein BG ₂Base stage connects R ₅, C ₆The other end, BG ₂Be connected resistance R between emitter stage and the ground ₇The on-off circuit IV is by transistor BG ₃, BG ₄, crystal diode D ₂, resistance R ₈Form, wherein BG ₃Base stage connects D ₂Negative pole, D ₂The anodal BG that connects ₂Emitter stage, BG ₃Colelctor electrode connects BG ₄Base stage, R ₈One end, R ₈The other end, BG ₄Emitter stage, BG ₂Colelctor electrode, R ₄The other end also connects the end of power switch K, and the other end of K connects power supply Ec, BG ₃Grounded emitter.Chimes of doom circuit V comprises the chimes of doom IC ₁, coupling capacitor C ₇, ultrathin loudspeaker Y, wherein IC ₁Input connects BG respectively ₄Colelctor electrode and ground connection, IC ₁Output passes through C ₇Connect loudspeaker Y.After each electronic component is welded on the printed circuit board, printed circuit board and ultrathin loudspeaker are fixed in the inclusion interlayer.

The utility model need not touch wallet owing to adopting above design as long as the human body hand is approaching, and warning device can be reported to the police immediately, and burglar-proof result is good, and is economical and practical.

Claims

1, a kind of novel thief-proof wallet, comprise inclusion, it is characterized in that it also has by inductosyn (I), oscillator (II), emitter follower (III), the warning device that on-off circuit (IV) and chimes of doom circuit (V) are formed, during normal the use, oscillator (II) output is an electronegative potential, emitter follower (III) is in cut-off state, on-off circuit (IV), chimes of doom circuit (V) is not worked, when human body hand during near inclusion, inductosyn (I) distribution capacity as one of oscillator (II) oscillation circuit element changes, the frequency of oscillation of oscillator (II) changes thereupon, because the effect of backfeed loop, the current potential increment of oscillator (II) output is input to on-off circuit (IV) by emitter follower (III) and makes it the switching tube saturation conduction, thereby connect chimes of doom circuit (V) power supply and send chimes of doom, after each electronic component welds, printed circuit board is fixed in the inclusion interlayer, and inductosyn (I) is then by the metal level that is produced on the two groups of mutually insulateds in inclusion surface or respectively on the inclusion surface, making metal level on the printed circuit board constitutes.