CN2230067Y

CN2230067Y - Telephone set with function of preventing out-door line from being fraudulent used

Info

Publication number: CN2230067Y
Application number: CN 95200527
Authority: CN
Inventors: 杨子雄
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-01-18
Filing date: 1995-01-18
Publication date: 1996-06-26
Anticipated expiration: 2005-01-18

Abstract

The utility model relates to a telephone set with a function for preventing an outdoor line from being fraudulently used, which comprises a rectification power supply, an outdoor line monitoring end of a telephone set, a broken line switch, a hand free switch, a bell receiving circuit, a dialing circuit, a talking circuit, a hand free circuit and an anti-eavesdropping special telephone device. One voltage monitor system and an alarm signal and interference signal system are arranged in the telephone set and matched with the telephone set. The utility model has various functions of a common telephone set and also has the special functions of eavesdropping prevention and for preventing the outdoor line from being fraudulently used.

Description

The anti-stolen telephone set of using of outside line

The utility model relates to a kind of telephone communication device, whether can in time find user telephone line specifically by others' steal, and can effectively stop the anti-stolen telephone set of using of outside line with giving, belongs to the HO4M1/00 class.

The outside line of subscriber phone is taken the situation of telephoning illegally by the people, occurs repeatedly, and on the one hand the content of conversing between the user is eavesdropped, and aspect steal person's means often are very much hidden in addition, and steal as at dead of night the time generally also is difficult for finding and stoping.

" phone splitter " this device of Decree of Patent Office of China CN2034354U Hu Hongtao design in order to solution on the pair of telephone lines and connect phase mutual interference between the multi-section extension set, problems such as eavesdropping, can only prevent from not eavesdropped when the user from making a phone call, it is occupied to monitor and alarm when not making a phone call outside line.

" the anti-eavesdrop device that is used for extension " of the quick design of Decree of Patent Office of China CN2164167Y Chen You, when the subscriber's extension conversation is eavesdropped, can send alarm, play the anti-eavesdrop function, but still can not the outside line of monitoring user telephone set, occupied situation whether when not conversing.

The purpose of this utility model is at above-mentioned deficiency, provides a kind of and can prevent that whether tap phone and monitoring telephone outside line be occupied, can in time stop steal outside line telephoning illegally again automatically.

The purpose of this utility model is achieved in that the stolen telephone set of using of a kind of anti-outside line, comprise that the double-end outside line of bridge rectification power and electric bridge monitors end, the broken string switch, hands-free switch, receive the bell circuit, the dialing circuit, speaking circuit, handfree circuit and anti-steal particular telephone instrument are formed: being characterized in thief-proof is the collector electrode of being connected transistor Q3 by anti-steal change over switch with the phone isolated plant, this transistorized base stage is passed through series resistor R5 in two triode Q1, the collector series connection of second level triode Q2 in the pressuring controling switch circuit that Q2 constitutes, the emitter of transistor Q3 is by series resistor R6 and by transistor Q4, Q5, two capacitor C 4, C5 and four resistance R 7, R8, R9, two triode Q14 of the multivibrator that R10 constitutes, the collector electrode of Q15 joins, multivibrator is added on the base stage of triode Q6 from the collector load resistor R11 of triode Q15, collector electrode as the triode Q6 of power amplifier is serially connected with the load buzzer.

Two-stage triode Q1, the Q2 of described pressuring controling switch circuit, its collector load is respectively resistance R 2 and resistance R 5, for making triode Q ₁, Q ₂The stable gradually element of base stage operating current is two capacitor C 1, C2, and is connected on respectively between base stage and the ground; The base potential control of triode Q1 is itself and the resistance R 1 of the lead-out wire connection of bridge power supply and the silicon voltage regulator diode D1 that is connected in series.

The triode Q3 that described pressuring controling switch circuit is controlled, the output of its emitter load resistance R26 current potential, it when unmanned steal outside line zero volt, not zero volt when the outside line of people's steal, it is the common port that is connected to three set of pieces by the emitter load resistance R6 of triode Q3 mutually, three set of pieces are silicon voltage regulator diode D3, shunt capacitance C3, and parallel resistance R4 reaches diode D2 and the resistance R 3 that is connected in series with it again.

The resistance R 12 and the light-emitting diode D4 of described power amplifier Q6 and collector load buzzer and clearing lamp are in parallel.

Owing to adopt such scheme, the anti-outside line of the utility model is stolen to be thief-proof with telephone device, promptly a monitoring voltage system, alarm signal and interference signal system be set in telephone set that special use is set in telephone set with telephone set, with telephone set be used constitute one one complete except that having the various functions of ordinary telephone set, also have anti-eavesdrop, prevent that the telephone set outside line is by the function of steal.

It is when outside line is monitored that the utility model also has characteristics, the anti-eavesdrop system works.The partial circuit of telephone set quits work.To guarantee that disconnected resistance index meets national regulation; In use, cut off the anti-eavesdrop system, can guarantee that phone every technical indicator when whole use confirms all to meet the provisions of the relevant regulations issued by the State through test and detection.

The utility model is practical, and is flexible, easy to operate, protected user benefit.

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the anti-stolen telephone set network figure that uses of outside line of the utility model

The anti-stolen telephone set of using of outside line of the utility model comprises bridge rectification power 10 and monitors that from the double-end outside line of electric bridge end 1,2 voltages are about 48 volts as shown in Figure 1.The broken string switch 4 of telephone set, hands-free switch 5 and anti-steal change over switch 3 constitute the transfer switch system that " ordinary telephone set " reaches anti-steal particular telephone instrument.Prevent steal change over switch 3 when connecting, power connection transistor Q3 13 collector electrodes, the voltage that is added on the pressuring controling switch circuit is 48 volts, is added in voltage stabilizing didoe D1 18 voltages and surpasses its rated voltage, there is current flowing in this loop, and via R1 21 → D ₁18 → R ₃23 → ground makes triode Q ₁11 base stages obtain dividing potential drop, and conducting, because of triode Q ₂12 base stage and Q ₁Collector electrode connects, Q ₁Current collection very " 0 volt ", Q ₂Base stage also be " 0 volt ", Q ₂End same triode Q ₃13 also end, and then emitter load resistance R6 26 output voltages of transistor Q3 13 are " 0 volt ".The multivibrator collector electrode of being made up of transistor Q4, Q5 is equated, alarm and interference signal generator no-output with the emitter current potential.When outside line had people's telephoning illegally, outside line monitored end 1,2, and voltage can be lower than 10 volts, and the voltage that is added on the votage control switch also is lower than 10 volts, is lower than voltage stabilizing didoe D ₁18 rated voltage, D ₁The no current circulation, Q ₁Base stage has only " 0 volt " to make triode Q ₁11 end.From power source voltage through R ₂22 → Q ₂Base stage makes Q ₂12 saturation conductions, electric current is through Q ₃Emitter → R of 13 ₅25 → Q ₂Collector electrode Q ₂Emitter → ground, the triode Q3 on pressuring controling switch circuit, the voltage that can export about 6 volts arrives alarm and interference signal generator, and they are made up of multivibrator and buzzer 17 that transistor Q4, Q5 form.Can export an interference signal this moment to telephone wire, and buzzer 17 can send alarm signal simultaneously, and is glittering as repeater lamp by light-emitting diode D4 21, and the people of telephoning illegally can't be used.When user own makes a phone call, cut off anti-outside line by the power path of steal isolated plant circuit by broken string switch 4 in the telephone set or hands-free switch 5, stop this system works, guaranteed that telephone set normally uses.

Receipts bell circuit 6, dial-up circuit 7, speaking circuit 8 and the handfree circuit 9 of the box indicating plain old telephone among Fig. 1, switch 3 are when guaranteeing that illegal use preventing system damages or this phone when making plain old telephone and using, and close this system and use.

Claims

1, the stolen telephone set of using of a kind of anti-outside line, comprise bridge rectification power (10) and monitor end (1 from the double-end outside line of electric bridge, 2), broken string switch (4), hands-free switch (5), receive bell circuit (6), dial-up circuit (7), speaking circuit (8), handfree circuit (9) and anti-steal particular telephone instrument are formed, it is characterized in that: anti-steal change over switch (3) is connected transistor Q3 (13) collector electrode, this transistorized base stage is by series resistor R5 (25) and two triode Q1, Q2 (11,12) collector series connection of the second level triode Q2 (12) in the formation pressuring controling switch circuit, the emitter of transistor Q3 (13) is by series resistor R6 (26) and by transistor Q4, Q5 (14,15) two capacitor C 4, C5 (36,37) and four resistance R 7, R8, R9, R10 (27,28,29,30) two triode Q14 of the multivibrator of Gou Chenging, Q15 (14,15) collector electrode joins, multivibrator is from the periodic square wave of collector load resistor R10 (30) output of triode Q5 (15), be added on the base stage of triode Q6 (16) by series resistor R11 (31), collector electrode as the triode Q6 (16) of power amplifier is serially connected with load buzzer (17).

2, according to the stolen telephone set of using of the described anti-outside line of claim 1, it is characterized in that: two-stage triode Q1, the Q2 (11,12) of described pressuring controling switch circuit, its collector load is respectively resistance R 2 (22) and resistance R 5 (25); For making the stable gradually element of triode Q1, Q2 (11,12) base stage operating current is two capacitor C 1, C2 (33,34), and is connected on respectively between base stage and the ground; The base potential ground control of triode Q1 (11) is itself and the resistance R 1 (21) of the exit connection of bridge power supply (10) and the silicon voltage regulator diode D1 (18) that is connected in series.

3, according to the stolen telephone set of using of the described anti-outside line of claim 1, it is characterized in that: the triode Q3 (13) that described pressuring controling switch circuit is controlled, the output of its emitter load resistance R6 (26) current potential, it when unmanned steal outside line zero volt, not zero volt when the outside line of people's steal, it is the common port that is connected to three set of pieces by the emitter load resistance R6 (26) of triode Q3 (13) mutually, three set of pieces are silicon voltage regulator diode D3 (20), shunt capacitance C3 (35), parallel resistance R4 (24) reaches diode D2 (19) and the resistance R 3 (23) that is connected in series with it again.

4, according to the stolen telephone set of using of the described anti-outside line of claim 1, it is characterized in that: described power amplifier Q6 (16) and collector load buzzer (17) thereof are in parallel with the resistance R 12 (32) and the light-emitting diode D4 (40) of clearing lamp.