CN2233103Y

CN2233103Y - Anti-theft door bell

Info

Publication number: CN2233103Y
Application number: CN 94248527
Authority: CN
Inventors: 赵习经
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-12-21
Filing date: 1994-12-21
Publication date: 1996-08-14
Anticipated expiration: 2004-12-21

Abstract

The utility model relates to a novel anti-theft door bell without a button switch, which adopts the conducting and sensing technology and comprises a sensor, a trigger, a door bell music circuit and a loudspeaker circuit. The indoor door bell can sound when a stranger knocks a door by hand only according to usage, and the defect that the normal use of the door bell is affected by damaging and disassembling and stealing is avoided by removing the button switch arranged outside the door for the door bell. The anti-theft door bell has convenient operation and installation, and the door bell can also send out signals when an evildoer breaks a door lock and prizes a house door.

Description

New-type theft-proof door bell

The utility model relates to a kind of doorbell, especially a kind of new-type theft-proof door bell.

At present, existing doorbell is to be connected lead with signal by doorbell push switch, doorbell electronic sound-producing device to link and combine.The doorbell push switch need be contained in outside the door, the doorbell electronic sound-producing device is installed on indoor, be connected with lead between push switch and the doorbell sound-producing device, the lead of connection usefulness need pass wall or door is received on the outdoor push switch, install inconvenient, and because push switch is contained in outdoors, be vulnerable to play virgin destruction and tear the robber open, influence is normally used.

The purpose of this utility model provides a kind of theft-proof door bell of new-type no push switch, adopt the conduction sensing technology, need push switch be installed outdoors, messenger is as long as knock at the door by practising strong hand, and indoor doorbell will sounding, because of having removed the push switch that is contained in outdoors, avoided doorbell easily to be damaged and torn the robber open, and, made easy to install and use owing to adopted the conduction sensing technology, as take place the bad person destroy door lock, prize, when pounding door, doorbell also can send signal.

The utility model is achieved in that in the circuit of doorbell electronic installation, conduction sensor (1), operation amplifier circuit (2), flip-flop circuit (3), doorbell music circuit (4), speaker circuit (5) is formed electric signal and is connected, conduction sensor can be adhesively fixed it on inboard center on the upper side on the door with glue, the doorbell electronic installation is installed on indoor local easily, there is signal wire to be connected between sensor and the doorbell, also complete machine all can be fixed on the inboard of door, when the people knocks at the door, knock the signal of door and pass to the sensor reception through the door body, sensor becomes electric signal with this conversion of signals, give flip-flop circuit after sending operational amplifier to amplify, the transistor flip-flop conducting, the work of doorbell music circuit is sent musical sound by loudspeaker.Be provided with trigger pip sensitivity adjusting potentiometer in the doorbell electronic device circuit, regulator potentiometer can change the sensitivity of the weight that receives the signal of knocking at the door, to adapt to the use needs of different metal of adapted or wooden door.(referring to accompanying drawing).

Because adopt such scheme, door does not need outward the doorbell push switch is installed, and sensitivity makes adjustablely, also can trigger the doorbell sounding even knock at the door gently, and is practical.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the sectional structural map of first embodiment of the utility model.

Fig. 3 is the sectional structural map of second embodiment of the utility model.

Among Fig. 1,1. being conduction sensors, 2. is operational amplifier electrical equipment; With capacitor C, resistance R ₁～R ₅, integrated circuit (IC) ₁Forming, 3. is flip-flop circuits; With potentiometer W, resistance R ₆, transistor BG ₁Forming, 4. is doorbell music circuits; With resistance R ₇, integrated circuit (IC) ₂Forming, 5. is speaker circuits; By transistor BG ₂, loudspeaker Y forms.In Fig. 1 circuit, the output termination commissure capacitor C of conduction sensor ZD, the common of the other end connection circuit of ZD, another termination operational amplifier IC of capacitor C ₁Input end, the output termination transistor BG of operational amplifier ₁Base stage, BG ₁Emitter insert the integrated music IC circuit ₂Trigger electrode, at BG ₁Base stage on be serially connected with sensitivity adjusting potentiometer W, IC ₂Output termination transistor amplifier BG ₂Base stage, BG ₂Collector meet loudspeaker Y.After power switch K closure, complete machine is in the quiescent operation state, if this moment, sensor ZD received knocking, will export a voltage signal, gives discharge circuit IC signal through the commissure capacitor C ₁Amplify, the signal after the amplification send the BG of flip-flop circuit ₁, transistor BG ₁Conducting makes music circuit IC ₂Work, IC ₂The signal of output is via transistor BG ₂Amplify, in generation,, moving loudspeaker Y sent musical sound.

In the embodiment shown in Figure 2, except that conduction sensor (1) is drawn the casing with signal wire (7), the remaining circuit components and parts are operation amplifier circuit (2), flip-flop circuit (3), doorbell music circuit (4), speaker circuit (5) all are contained on the interior wiring board (8) of plastic casing (6), sensor is fixed on the interior upside of door during use, and the doorbell electronic installation can be installed in indoor local easily.

In another embodiment shown in Figure 3, conduction sensor (1) is not drawn outside the casing, but is contained on the interior wiring board (8) of casing, and complete machine is an one like this, and the interior upside that during use complete machine is fixed on door gets final product.

Claims

1. new-type theft-proof door bell, in the circuit of doorbell electronic installation, conduction sensor (1), operation amplifier circuit (2), flip-flop circuit (3), doorbell music circuit (4), speaker circuit (5) are formed electric signal and are connected, it is characterized in that: the output termination commissure capacitor C of conduction sensor ZD, the common of the other end connection circuit of ZD, another termination operational amplifier IC of capacitor C ₁Input end, the output termination transistor BG of operational amplifier ₁Base stage, BG ₁Emitter insert the integrated music IC circuit ₂Trigger electrode, at BG ₁Base stage on be serially connected with sensitivity adjusting potentiometer W, IC ₂Output termination transistor amplifier BG ₂Base stage, BG ₂Collector meet loudspeaker Y.

2. theft-proof door bell according to claim 1 is characterized in that: the circuit elements device of operation amplifier circuit (2), flip-flop circuit (3), doorbell music circuit (4), speaker circuit (5) all is contained on the interior wiring board (8) of plastic casing (6), conduction sensor (1) available signal line (7) is drawn outside the casing, also can be contained on the wiring board (8) in the casing.