CN2229100Y

CN2229100Y - Contactless electronic horn

Info

Publication number: CN2229100Y
Application number: CN 95208139
Authority: CN
Inventors: 陈颂华
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-05
Filing date: 1995-04-05
Publication date: 1996-06-12
Anticipated expiration: 2005-04-05

Abstract

The utility model provides a contactless electronic horn which is controlled by an electronic circuit. A main control circuit is composed of a symmetrical-wave-shaped CMOS gate circuit multi-vibrator so as to reduce operation current. An electronic circuit board (8) and a driving pipe (21) are directly arranged on a pressing board (5) and a bottom seat (6), the reliability is added, and the heat radiation conditions are improved. A full-wave rectifier (18) is additionally arranged on the input end of electronic circuit, so the polarity does not need to be considered, when the contactless electronic horn is used.

Description

A kind of contactless electronic loudspeaker

The utility model belongs to a kind of automobile-use warning signal loudspeaker technical field.

The warning signal electric horn is the device of automotive indispensability such as automobile, is used for sending warning signal when driving, with plan safety.The approximate a kind of electric bell device of the principle of work of existing loudspeaker promptly utilizes electromagnetic attraction, and diaphragm is inhaled down, cuts off circuit when diaphragm moves downward, and electromagnetic force disappears, and diaphragm is connected circuit again by returning elastically simultaneously.Switching so repeatedly makes the diaphragm vibration and sounding.This switching is finished by a pair of platinum contact usually.Since when work electric current reach more greatly because of perceptual energy storage so, usually bigger electric arc takes place and damage the contact, become existing shortcoming that is difficult to overcome of loudspeaker.

Some once occurred and substituted the contactless loudspeaker of mechanical contact work, all proposed the device of this aspect as Chinese patent No. 88201308, No. 89205363.1 etc. by electronic installation.But because the some shortcomings of electronic circuit, circuit board is in use made troubles, and is easily broken down by some problems of existence such as positive and negative polarity of dress and power supply wiring.The purpose of this utility model is to provide a kind of suitable circuit and structure, makes the work of loudspeaker more reasonable, reliable and convenient.

The purpose that the utility model proposes is achieved like this, and selects a kind of rational oscillatory circuit, makes its waveform can keep symmetry naturally, thereby can keep electromagnetic oscillation, makes working current reduce to minimum again.Secondly circuit board directly is installed on the base, rather than is installed on the connection terminal before resembling.Connection terminal is used for again conducting electricity both with fixing, and because of connection terminal needs fix through inside and outside insulating mat, Chang Yin is heated and becomes flexible, and causes that conduction is bad.In addition, driving tube also is directly installed on the base, and more favourable its heat radiation makes work more reliable.Because electronic circuit must be by the polarity wiring, not only inconvenience, and fragile circuit.In electronic circuit, set up the full-wave rectification circuit,, use convenient so polarity can not be taken in wiring into account.

From the above mentioned as seen, loudspeaker provided by the utility model can make its reliable operation, and working current reduces, and is easy to use, satisfies customer requirements better.

Below in conjunction with accompanying drawing, the loudspeaker that the utility model is provided are described in further detail.

Accompanying drawing 1 is the horn structure sectional view.

Accompanying drawing 2 is control system basic circuit diagrams.

Accompanying drawing 3 be circuit board by dress figure.

In the accompanying drawing 1, [1] is static iron core, and [2] are set nuts, [3] be support, [4] are solenoids, and [5] are pressing plates, [6] be base, [7] are packing rings, and [8] are circuit boards, [9] be diaphragm, [10] are iron core, and [11] are acoustic screens, [12] be packing ring, [13] are rivets, and [14] are the internal wiring sheets, [15] be insulating washer, [16] are sheaths, and [17] are external wiring pieces.Dynamic and static iron core [10], [1] are made by soft magnetic material, are subjected to the alternating electromagnetic force effect of solenoid [4] and attract each other, and drive diaphragm [9] vibration and sounding.Diaphragm [9] is made by the manganese steel sheet of excellent spring.Static iron core [1] screws in from the base center, regulate the distance with moving iron core [10] after, with nut [2] locking, support [3] also is fixed simultaneously.Solenoid [4] places base [6], compresses with pressing plate [5], rivets tightly on base [6] again.Diaphragm [9], acoustic screen [11] are riveted on motion together on the moving iron core [10].Acoustic screen [11] is adjusted the inertial mass of vibrational system, reaches suitable point of self-oscillation, improves tonequality and volume.Diaphragm [9] lower end driving fit is in base [6], and crimping is fastening again.Cavity between diaphragm [9] and the base [6] is used for mounting circuit boards [8] and solenoid vitals such as [4], so rivet [13], static iron core [1] and diaphragm [9] and base [6] fixing position should smear marine glue, prevents that moisture from invading, and increases sealing.

In the accompanying drawing 2, [18] are rectifiers, and [19] are wave filters, and [20] are king oscillators.The multivibrator of forming by the CMOS not gate, wherein R ₁Be feedback resistance, R ₂Be speed adjusting resistance, C is a speed governing electric capacity, all adopts high stability metalfilmresistor and polyvinyl fluoride electric capacity, to increase frequency stability.By R ₂, C form alignment circuit time constant between 1.3/1000ths～1.4 seconds, oscillation frequency at this moment is about between 350～320HZ.CMOS gate circuit noise margin height, the power source voltage wide ranges is particularly suitable for using under the situation such as, spread of voltage big in interference such as automobiles, adopts multivibrator that 555 integrated packages form because waveform obviously asymmetric causes working current bigger than normal.CMOS gate circuit multivibrator waveform symmetry, the work period can be greater than quiescent period, so working current is reduced.[21] be driving tube, it can be single or compound triode.[4] be solenoid, diode connected in parallel is done afterflow and is used.The power supply that is come by rectifier [18] is after wave filter [19] filtering, and king oscillator [20] is given in power supply, and its output promotes driving tube [21].Solenoid [4] one termination rectifier [18] positive output ends, the collector plate of another termination driving tube [21] links to each other with rectifier [18] negative pole then.

In the accompanying drawing 3, [6] are bases, and [14] are the internal wiring sheets, and [5] are pressing plates, and [8] are circuit boards, and [4] are solenoids, and [21] are driving tubes, and [22] are rivets.Circuit board [8] is directly installed on the pressing plate [5] with driving tube [21], after pressing plate [5] compresses solenoid [4], with rivet [22] directly and base [6] rivet tightly, circuit board [8] is not originally to be installed in like that on the connection terminal that internal wiring sheet [14] locates, can avoid making connection terminal loosening because of temperature variation, the circuit board shakiness is conducted electricity bad.Driving tube [21] directly is installed on the pressing plate [5], has improved radiating condition, has increased reliability.

Embodiment

Wave filter [18] is connected into full-wave rectifying circuit by 4 * 1N5401 commutation diode, and wave filter [19] is that 0.03 second RC element is formed by time constant.King oscillator [20] is made up of the CMOS gate circuit, feedback resistance R ₁Be 300K, the alignment circuit time constant is 1.4/1000ths seconds, and driving tube [21] is made up of D652 plastic packaging power tube, β＞100.Solenoid [4] is made up of around 150 circles 0.4 enameled wire.Circuit board [8] is glued on the pressing plate [5].Driving tube [21] is directly fitted through insulating mat and is fixed on the same pressing plate [5], and pressing plate [5] compresses solenoid [4] and is riveted on the base [6] again.The power end of circuit board [8] joins by lead-in wire and internal wiring sheet [14], joins by connection terminal and external power again.

Claims

1. contactless electronic loudspeaker of forming by dynamic and static iron core [10.1], solenoid [4], diaphragm [9], acoustic screen [11], base [6], support [3], electronic circuit board [8] etc., the input end that it is characterized in that electronic circuit board [8] is connected to rectifier [18], electronic circuit board [8] and driving tube [21] and is directly installed on the pressing plate [5], and pressing plate [5] becomes integral body by rivet [22] and base [6] are affixed.

2. according to the contactless electronic loudspeaker of claim [1], it is characterized in that described rectifier [18] forms full-wave rectifying circuit by 4 commutation diodes.

3. according to the contactless electronic loudspeaker of claim [1], it is characterized in that described king oscillator [20] is made up of CMOS gate circuit multivibrator.

4. according to the contactless electronic loudspeaker of claim [3], it is characterized in that the governing time constant R of CMOS gate circuit multivibrator ₂C is between 1.3/1000ths～1.4 seconds.