CN1812660A - Hand-free double-directional loudspeaker for receiver of small telephone and power amplification and control circuit thereof - Google Patents

Abstract

A two-way loudspeaker being used on micro telephone set and being set with hand free receiver is composed of loudspeaker and its audio control switch, stopping and audio output capacitor, diode, power amplifier tube with its collector and emitter as well as base resistor, input control switch of audio signal and input capacitor of audio signal .It features that the mode of said loudspeaker or receiver can be switched over freely.

Description

Hand-free double-directional loudspeaker for receiver of small telephone and power amplifier thereof and control circuit

Because of the telephone set of the convenience of telephone set hand-free function, production and marketing manufacturer production and marketing at present all is with hand-free function basically, simultaneously, be receiver for different needs such as maintain secrecy must keep the sounding components and parts again.Traditional hand-free function mainly is to realize with corresponding power driving amplifier by installing sounding components and parts loud speaker additional, this has just increased loud speaker and weight thereof and its shared area and volume inevitably, equally also make machine volume inevitably, weight, (fact all proves with experience reliability repeatedly: under the identical prerequisite of other condition, failure rate often always becomes high-positive correlation with the number of component number) and design and the corresponding increase with difficulty of manufacturing cost, especially in the face of more and more miniaturization, ultra-thinization, the development of ultralightization and consumer market demand general trend then more demonstrate most important property such as its market competitiveness height.Receiver generally all is that impedance is very high for loud speaker, the sounding components and parts that power is very little, therefore it is difficult to replace loud speaker and function thereof, and because of the impedance height carefully makes the D.C. resistance of its coil very big with line, adding because of high impedance makes power output very low, these factors add makes its power consumption and heating also just inevitable equally very big together, so its energy utilization efficiency is very low, especially for being extensive use of, the mobile phone that quantity is extremely huge and other audio communication equipment, energy utilization efficiency is low just to be meaned must strengthen and transmits and receives power, and this just increases amount of electromagnetic radiation inevitably, particularly to the bigger electromagnetic radiation intensity of human body harm; There is a kind of wide-spread and what is called of using to replace the receiver of nearly body to reach reducing IVR equipment to comprise that mobile phone is the amount of radiation of mobile phone and intensity and to the extent of injury of human body with ear (plug) machine, actually this is not so, this way only can be strengthened but not weaken electromagnetic pollution and harm to human body and surrounding enviroment, because connect between the resistance of the electric wire of earphone and earphone voice coil loudspeaker voice coil winding and they, comprise and this machine between distributed capacitance (amount) between formed mutually one and/or a plurality of new be equivalent to the capacitance-resistance coupling and with the electromagnetic wave repeat transmitted and the receiver of induction type, promptly this moment earphone and on line thereof proper strengthen propagating the antenna of electromagnetic radiation, and it is more much longer than airborne antenna, the scope of laying is much also wide, the scope and the intensity of electromagnetic radiation has just been strengthened in the stack of these factors greatly, and the harm nature is just bigger wider than nearly body earphone; Also has a kind of same wide-spread and use, even ratio increase earphone is exactly to increase so-called radiation proof pad pasting to reach the electromagnetic radiation and harm purpose that weakens audio communication equipment such as mobile phone widely, this also is a kind of real erroneous tendancy that can realize that is difficult in fact, because detecting, many authoritys fact proved that most so-called radiation proof pad pastings or other so-called protection film substantially do not possess radiation protection ability, seldom even at all can not alleviate any radiation and energy thereof, even so, even if very can effectively alleviate radiation and harm, also transmitting and receiving signal strength signal intensity with sacrifice is cost, because can alleviate the means of radiation intensity mainly is nothing but shielding electromagnetic wave, this just must cause transmitting and receiving power with increasing is that cost is offset diaphragm to shielding electromagnetic waves, can't help consuming energy more, and the amount of electromagnetic radiation and the intensity that also can positive correlation ground increase human body because of the increase of amount of electromagnetic radiation and intensity are the extent of injury, also the increase because of power is significantly shortened battery life, the time that use each charging back also significantly shortens, even if reduce emission and received power to reduce electromagnetic hazard and pollution and battery consumption to improve directivity (the radio wave directivity is very strong), but this just makes that wireless audio communication device orientation is extremely strong, speech quality such as sound are suddenly big or suddenly small, smudgy, intermittent even conversation fault waits as broken string repeatedly functional reliability and other performance is greatly reduced, solution remain add high-power, so its harmful consequences is basic identical, and these factors also all can have a strong impact on the product market competition ability and serious increasing because of battery scrapped the increase of the environmental pollution that produces and use cost such as accelerating (battery of mobile phone is generally all more expensive, tens of at least even up to a hundred yuans); Increase loud speaker and can effectively reduce the electromagnetic radiation and the harm of and surrounding enviroment next to the shin, but have aforesaid such as increasing not enough problems such as components and parts and volume thereof, area, weight, cost to human body because of answering to die with respect to the remote-wireless that receiver is sayed.Obviously, innovation sounding components and parts that the low radiation hazard of the confidentiality of receiver and loud speaker if can be combined and be equipped with innovation and can (easily) control drive power amplifier, then it can not only effectively overcome the serial shortcoming of above-mentioned prior art and product, and its serial main advantages is that advantages such as the market share all are conspicuous all will finally be embodied in the market competitiveness especially.

Total be exactly the present invention for a series of problems that solve prior art and product design, for hand-free double-directional loudspeaker for receiver of small telephone and the power amplifier and the control circuit of one goal of the invention, existing principle, scheme and major advantage are continued to introduce as after.The present invention directly utilizes receiver and the position that is had thereof, volume, area, weight with it, and get rid of and decide circle and vibrating diaphragm and iron core, change so that the vibrating diaphragm of direct sounding is integrated respectively but wire circle seldom is moving-coil and strong magnetic permanent-magnet alloy replaces, resistance is big by the superfine number of turns in line footpath is a lot of to change receiver, power consumption and heat production are all more decide circle generate an electromagnetic field earlier and magnetize iron core, the indirect sounding of vibrating diaphragm is inhaled, put to the suction, the thrust that are produced by the iron core after the magnetization again operation principle and pattern; Big and the little tonequality of integrated distortion is more true to nature and sensitivity is higher because of the moving-coil space, the number of turns few and easily increase line directly thus the resistance energy consumption and the heating littler, but it can bear and export very big audio power, not only solved receiver and decided circle little such as power, the energy consumption height, serious distortion even hoarse unpleasant to hear all difficult problems such as serious noise that the easy distortion of sound causes because of the vibrating membrane space is extremely limited when especially sound is big, also magnetic material just can obtain powerful permanent magnetic because of the superpower magnetic that adopts strong magnetic permanent-magnet alloy and have only needs seldom with same powerful magnetic reserve capability, make product of the present invention extremely easily do very for a short time, very light, very thin but its tonequality, power and sensitivity are but very excellent, thereby solved small-sized that existing product needs to be resolved hurrily, ultra-thin, ultralight, high-power and high tone quality, a serial difficult problem such as high sensitivity, be equipped with controlled easily (convenience) control power driving circuit again, just satisfactorily realized the present invention and goal of the invention thereof comprehensively for a total inventive concept.

Accompanying drawing and operation principle and advantage explanation:

Contrast accompanying drawing: Y is a loud speaker; V is the magnet of Y; Q ₁, Q ₂And Q ₃Be three moving (sound) independent of each other circles of Y, wherein: Q ₁For interior type moving-coil (is called for short inner ring, Q ₂And Q ₃Similar abbreviation), B is for reinforcing Q ₁And specially designed backplane level, Q ₂Be centre circle, Q ₃Be the outer ring; X is Q ₁And Q ₂The hollow magnetic pole; Z is that the vibrating membrane of Y is a sounding body; P is the fixed support of the Z Q that holds concurrently ₃Magnetic pole; D is a diode; J is a power tube, and c is that output (current collection) utmost point of J, base stage, the e that b is J are the emitter of J; K ₁Be audio signal input control switch, K ₁', K ₁" be respectively K ₁An end; K ₂, K ₃Be respectively Q ₁Two group winding FF ' and the audio input end F of GG ' and the control switchs of G of coil M; K ₄, K ₅Be respectively Q ₂Two group winding HH ' and the audio input end H of II ' and the control switchs of I of coil N; K ₆, K ₇Be respectively Q ₃Two group winding JJ ' and the audio input end J of LL ' and the control switchs of L of coil S; C ₁Be the audio frequency input capacitor; C ₂For every direct sum audio frequency output capacitor; R ₁Be power tube J base stage b (biasing circuit, electric current) resistor; R ₂Power supply and loading resistor for c; R ₃Resistor for the working point of the path of e and stable J.

C ₂An end and K ₂-K ₇An end be electrically connected, C ₂The other end and negative pole and c and the R of D ₂An end be electrically connected K ₂-K ₇The other end be electrically connected respectively with own corresponding F-L end, each end of F '-L ' is direct with power supply-it is ground connection that (bearing) utmost point is electrically connected, the positive pole of D and K ₁An end K ₁' be electrically connected K ₁Other end K ₁" be electrically connected with b, K ₁With R ₁And C ₁An end be electrically connected R ₁And R ₂The other end and power supply+extremely be electrically connected C ₁The other end be electrically connected (omission), R with this machine audio-source output ₃An end and e be electrically connected, R ₃Other end ground connection.

The contrast accompanying drawing is further introduced structure, function and innovation advantage: loudspeaker Y is because adopting the permanent magnetism ferromagnetic material, so its magnet V does very thinly, magnetic core X also makes hollow type, this has just alleviated weight and volume greatly; In addition, thus because of magnetic core be multistage and for hollow type can select arbitrarily interior, in or outer core layer and corresponding space thereof be used as and lay moving-coil Q₁、Q ₂And Q₃And Its activity space, especially when combined simultaneously placed three due to the use of the voice coil and the permanent magnet three times to increase the output power and the three A voice coil and the vibrating membrane corresponding to the position of the volume and quality of different beneficial regulation may further use, the appearance Moving coil type within the interior space of two dynamic moving coil windings are fabricated on the inner wall and the middle, including moving coil shape, the outer wall The fabric on one winding (this design as well as series of other advantages, see below), which also eliminates the need of the moving coil and its activities Should occupy a lot of space leaving other more compact speaker; Furthermore, the present invention is a moving coil windings that changed the traditional single single coil wound Single lane in the same direction for the series winding between both dual and single-use can be connected in series or parallel usage and uses a variety of independent windings being alone Li coil, so that each coil, the diameter and weight and effective (ie, generation and cutting magnetic lines) line length and size, and both contribute Evenness and resistors (including DC resistance and AC impedance), etc. with the volume and increase the output power and reduce the distortion is to enhance the sound quality (see To be described later) is closely related to a series of key indicators and data at the same time be highly consistent, which is a significant lack of conventional coil Point and unmatched, as it the single coil DC resistance and energy consumption (DC resistance due to direct energy and reduce the output power Rate and fever, and even burn the voice coil of things to have occurred, is not uncommon, relatively speaking impedance AC resistance is generally not energy No fever) only the traditional voice coil in series 1/2, when only a small volume when either the handset or speakerphone mode can only either With a set of voice coil to reduce the volume and power to extend battery life and life, when you need a large volume of the voice coil in parallel when the DC Conventional serial coil resistance is only 1/4, because these are two separate coils and the number of turns of each of the DC resistance of only the string United coil 1/2, while increasing the doubled because of the parallel equivalent diameter, the DC resistance can be further reduced by half, when the need to very bass Amount may also be connected in series, we can see its adaptability, applicability and packages (and) very wide capacitive strong advantage indeed more important, too, Because these tools is the main function of the majority of audio and use value lies; fourth, not only due to expansion of the coil diameter plus Large and outward direction, the magnetic core is designed to be a hollow core and the inner movable ring is designed and the corresponding inner windings, especially The present invention is attached to the inner coil due to the inner wall of the voice coil bobbin, coil winding can make use of non-protective effect of the outer wall of the hard magnetic Friction core, unless severe friction are worn to the extent of the outer wall, and the possibility that the probability is very small, Also still do a coil at the bottom of about 0.1-1mm thick plate can be thin layer B to enhance support force, plus the top and vibration coil Moving film firmly glued directly even within the voice coil and diaphragm shape made directly integrated and powerful resistance to deformation, these are also the Invention, it may have a series of important unique advantages, it can effectively prevent the common traditional double-pole magnetic seam formed solid core Due to the moving coil speaker coil core long-term exercise and heat or moisture expansion and deformation due to collision or fixed fastening materials such as double-pole Binders such as nails or screws loose glue to make double pole is displaced due to friction between the coil and the core sound small distortion and when the coil insulation Layer (enameled paint is thin and heat due to softening or degeneration such as adhesion reduction or even rupture and it is easy to quickly) is the core frayed Resulting from the strong noise] or a combination of space activity type, not only effectively prevent the deformation and displacement and its adverse consequences, but also effectively reduce Light weight and / or volume, and high (especially outside combined use type and converted to the two permanent force of sound power) Li With an internal magnetic field strength and magnetic flux density is much higher than outside, the magnetic flux density is much higher than the external magnetic field characteristics, which makes the move Even through the loop only in the weak and only a weak alternating magnetic field generated with the magnetic force of the permanent magnet but its constant generated by a strong permanent Long magnetic interaction (the same polarity magnetic repulsion, different polarity magnetic phase lead), it will also produce a result with its powerful permanent magnet Kind of strong absorption, repulsive force is significantly increased (equivalent to the amplification) of force, thereby increasing the energy of the dynamic activity, Promote bonding with it as one of the diaphragm that is sounding body Z simultaneous increase in the energy, which is smaller alternating magnetic field (force) By means of a strong permanent magnet, only to consume low power of the utterance can be easily consideration of the Permanent Magnetic Forces also converted into audible part of the energy consumption required to promote the voice coil and diaphragm being shipped (vibration) and thereby moving into the kinetic energy Conversion step for promoting the air transport (vibration) of the kinetic energy of moving the audible sound energy, and thus a small input power can also be obtained Large volume, which increases the output power of the moving coil, the alternating magnetic field that is smaller by a strong permanent magnet can be put there Large, so a small input power can get a larger output power and the power of the present invention can loudspeaker driver circuit and the phase Should be small and lightweight components for further high-quality, consumption of electricity and heat according to the law of conservation of energy principle also due to lose The power increases while smaller, thereby significantly reducing the sending and receiving power and heat and battery and its energy consumption and environmental pollution and The use of cost, as a result only a small voice input power, it makes only a small audio input signal can reach the target call , The equivalent of improving the overall call quality such as reduced sensitivity and directivity and call disconnection, etc., which can transmit and receive Power can be reduced bidirectional, meaning that either the transmitting station and the number of devices and transmitting or receiving device that transmit power and The corresponding mobile audio receiving device can be bi-directional transceiver power reduction; in the ring and outer windings made of inside and outside each one single Layer coil, not only the moving coil type as the inner coil can be reinforced to reduce deformation of the voice coil, but also because the inner and outer coil of the voice coil, Wall fastening and adhesion in opposite directions and cancel each other out, and when the coil is energized work where the coil is divided into inner and outer Monolayer, each producing less heat (only double 1/2) and due to heat (inner plus outer) area increases exponentially fast heat dissipation, so Cooling effect, in addition, because of thermal expansion of the inner coil and the outer ring in the same direction that is outward expansion of the inner space needed Exactly between the outer ring expansion to expand the gap can be provided, and when the voice coil power to stop work and heat production, its inner and outer coils Consistent cooling contraction that are inward direction, the inner ring contraction just vacated space required for the outer ring contraction internal Space, these factors have ensured sound circle, external thermal expansion coefficient and high degree of consistency, in other words, while And comprehensive high quality done less heat, heat quickly, the same type, this series is the traditional advantage that no outgoing double voice coil Available, such as deformation of the voice coil, the winding and even burning off loose even most are mainly due to the heat generation layer overlapping windings Fast, slow heat, and between the voice coil and the winding and uneven force caused by thermal expansion coefficient; loudspeaker diaphragm Z and Y Fixed voice coil Q branch (ADS) and the magnet frame P made of the same width and parallel to, and because of its width and parallel to the magnet, but also with the magnetic Hollow core of iron that is made of the same material and the same magnet with strong permanent magnet, it is also used as the outer magnetic poles and strengthening effect on the move The permanent magnetic ring and effectiveness, and both for the inner and / or outer especially outer magnetic enhancement effects are extremely significant and Further miniaturization of the speaker light, so that the overall volume and weight of the speaker absolute minimum, these favorable factors Further more effective in reducing both the machine, especially large-scale production and use of the phone's size, weight, heat and energy consumption Consumption and environmental pollution and the use of cost, such as extending battery life and reducing the number of base stations (transmission power) scale and launching and Receiving equipment received and transmitted power of the human body caused by electromagnetic hazards and environmental pollution quantity of waste batteries and reduce battery Energy consumption and extend battery standby time and improve market competitiveness (thin miniaturization is essential signs, and low heat Is a fundamental prerequisite for a small thin), and other significant advantages; diode D acts as when using the speakerphone when compared to the energy Small audio signal using its forward conduction characteristics in order to directly enter the loudspeaker, making it only the faint sound to fit the earpiece Just a small volume characteristics, time and act as a speaker instead of the handset earpiece and play using the appropriate function, and whether the speaker is When used as a handset or speakerphone diode D and can automatically use its great resistance to block the power amplifier inverting tube J output (set Electricity) pole c its power and load resistor R ...₂The direct current reverse pumping to K switch₁', also just having avoided the prime audio signal source is C₁And line because of with K₁Even ' too near and induction that easily cause when loudspeaker is done hands-free the use and through power tube the distortion whistle after reflex is amplified repeatedly etc. interference, but loudspeaker when the receiver state because of base stage b without bias current, not conducting of J, its c utmost point and R₂Though upper have the direct current pressure drop but without electric current and power or direction, change, namely without alternating signal, produce, therefore also without C₁Induction problem is namely noiseless, the positive terminal of D with every straight (stream power supply) capacitor C₂An end be electrically connected to, its negative pole end inputs gauge tap K with audio signal₁An end K₁' be electrically connected to, so that the input channel of the loudspeaker audio frequency power supply under the receiver state to be provided; C₂Can isolate simultaneously R₁And R₂Equal not identical direct current pressure drop and the DC currents of generation and character and effect respectively, to avoid moving-coil also because of by these direct currents and produce that permanent-magnetic field power is resisted and the i.e. reduced side effects such as " demagnetizations " or destroy loudspeaker and comprise the performances such as tonequality and volume, K of the magnetic that weakens the loudspeaker permanent-magnet material₂-K ₇Effect be further to regulate and control tonequality, volume or quiet, also regulated and controled when volume because of regulation and control vibrating membrane vibration position, intensity and amplitude Effective Regulation tonequality: when each key is all closed the volume maximum, while all opening be quiet, the rest may be inferred, the traditional approach of reduction input audio signal intensity that so just can be by routine regulates and controls tonequality, volume, thereby reduce noise, improves signal to noise ratio and namely improves tonequality; K₂-K ₇Also can to adopt variable resistor be potentiometer is regulated to gradual change type with the transition formula volume tonequality that becomes switch and regulates and controls continuously, and no matter is to adopt switch or potentiometer regulation and control all more reliable, convenient and simple than the loaded down with trivial details perishable integrated chip computing circuit of complexity and regulation and control; C₂Another effect be regulation and control tonequality, by regulating C₂The capacitance size control the frequency high low range of the tone currents that passes through, due to C₂Also be C in when loudspeaker doubles as receiver and uses₁Tone currents path is provided, namely has been the total path that comprises power amplifier output tone currents, its capacitance is because considering that the large value of the electric current that passes through is generally than C₁For greatly, again because of C₂With C₁What form is series capacitance circuit and cut down C₂The part capacitance, add at C₁And C₂Middle D in addition₂The DC internal resistance in number Europe-tens of Europe is to from C₁The attenuation of certain amplitude of tone currents of upper frequency, therefore be easy to by suitable adjustment C₂(actual measurement is about C₁The 3-10 of capacity is doubly) capacity just can the compatible C of fine realization₁Frequency characteristic is overall tonequality balance; Pass through K₁Connecting and disconnecting R₁Be electrically connected to change the permanent fixedly electrical connection pattern of traditional bias current with the bias current of b, therefore not only can ensure aforesaid when with receiver the power tube base stage because of be cut off without bias current do not produce noise jamming receiver tonequality, also can ensure when loudspeaker replace receiver with the time provide the power tube bias current to reduce distortion to improve tonequality, e by series connection with it stable operating point and doublely do little resistance (generally the being about 0.5-1 Europe) resistance R that protector is used₃Ground connection, to form audio frequency alternating current circuit loop.

Embodiment and operation principle of the present invention and advantage supplementary notes: contrast accompanying drawing, so loud speaker Y because of adopt permanent magnetism ferromagnetic material its magnet V and magnetic core X all do very thin, general 0.2-0.5cm even more (surpass) thin promptly enough, magnetic core X makes hollow type and will move (sound) and enclose Q ₁And/or Q ₂The unsettled the top that is placed in magnetic core is the magnetic pole place, the moving-coil wall is to keep 01-0.2mm intermittently to be advisable with magnet core wall, because have only the magnetic line of force at magnetic pole place the most concentrated, the die magnetic force of density is the most powerful, the degree of depth of laying topmost flushes on the plane with magnetic core substantially with facial planes in the voice coil loudspeaker voice coil winding, to ensure the voice coil loudspeaker voice coil Shi Douke cutting magnetic line and produce the maximum promotion vibrating membrane i.e. power of vibration that is synchronized with the movement to greatest extent that no matter moves up and down, thereby obtaining the maximal audio power output is max volume, the shape of vibrating membrane can be a matrix, convex, plane, round, square type or other Any shape or its combined shaped all can, present embodiment is that further conserve space adopts plane, but this to be not the present invention can only adopt planar shaped (down with); Diode D with power greater than the silicon of 0.1W, withstand voltage any kind greater than 6V or germanium diode all can, present embodiment adopts good and cheap and the most widely used 1N4004 and 1N4007 etc.; Power tube J with power greater than the PNP of 0.3W, withstand voltage any kind greater than 20V or NPN pipe all can, accompanying drawing adopts 0.5-1W, withstand voltage 25-50VNPN type, gets final product as adopting the positive-negative-positive power supply polarity being opposite with the NPN type; Audio signal input control switch K ₁With the two group switches of the miniature hilted broadsword of any kind such as press-key lock fixed pattern, dial type, Electronic Control as touch or press-type etc. all can, present embodiment adopts push type, use operating maintenance etc. more simple and convenient; With K ₁As a same reason, voice coil loudspeaker voice coil K switch ₂-K ₇Also with miniature press-key lock fixed pattern but use hilted broadsword simply connected formula instead and get final product; Capacitor C ₁With the non-polar condenser of capacity greater than 0.1 μ F, withstand voltage 6-10 volt, present embodiment adopts 0.3 μ F6.3 volt; Capacitor C ₂With capacity greater than the nonpolarity or electrolytic capacitor of 1 μ F all can, present embodiment adopts 10 μ F10 volt electrolytic capacitor; R ₁And R ₂Resistance with the difference at double of concrete power tube J and parameter such as multiplication factor etc. and mains voltage variations broad, obviously also just can not be in advance in concrete mode such as embodiment and stipulate its occurrence, so state reference value R ₁200 Europe-20K and R ₂20 Europe-2K use only for reference, but this does not influence the described those skilled in the art of Patent Law at all and implements this patent, because at the selected back of concrete power tube, its product description or consult reference book such as handbook and all can obtain every accurately concrete parameter, to make parameter reach optimum range also be the most basic prerequisite general knowledge and test a large amount of and commonly used is arranged equally and the detailed introduction of method of adjustment and reference book, product description etc. and record and belong to general knowledge together to adjust resistance value; As previously mentioned, because of R ₃Function mainly be stable operating point and serve as insurance (resistance) thread, and the promptly in most cases little in normal operation big variation of these functions, so it is less demanding to accuracy and accuracy, in most cases resistance is all very suitable in the interval in 0.5-2 Europe, too low stability and safety effect is poor, too high important parameters such as amplifying power influence to loud speaker and the power tube power output and the latter is bigger; All the other situations and accompanying drawing and explanation thereof, advantage are introduced similar, no longer repeat superfluous stating.

the present invention also has following serial great advantage: because the present invention integrates receiver and loudspeaker and function thereof and can freely switch and switch extremely convenient, can switch to arbitrarily at any time receiver or loudspeaker mode and need not to interrupt conversation, single loudspeaker doubles as receiver and ultra-thin, ultralight, subminaturization (can do also little also light also thin more much than receiver earphone) and high sensitivity, high effect and high-output power and tonequality are graceful, the serial great innovation of the little grade of distortion and advantage, these advantages are for realization and meet the frivolous miniaturization of product, especially the melodious grace of tonequality and consumer's needs at any time and likes and freely select arbitrarily to converse and crucial serviceability and the consumption demand aspect of many decision market shares such as Music Appreciation mode provide very big convenience and competitiveness, as be beneficial to and correct so-called ear (plug) machine and alleviate radiation and reach erroneous tendancies such as harm to the user, because as aforementioned use earphone, not only bothering inconvenience, and real in having increased radiation and harmfulness.

The present invention integrates the great advantage of above-mentioned series, therefore tool applications well and market prospects, as except the above and mobile phone etc. require frivolous small-sized low energy consumption lower calorific value application, such as wide too with the application in frivolous small-sized high tone quality electronic applications such as the notebook computer in the huge market of tool, sounding electronic dictionary and products thereof with mobile phone.

Claims (10)

1, a kind of hand-free double-directional loudspeaker for receiver of small telephone is made up of vibrating membrane, vibrating membrane fixed support, ferromagnetism alloy permanent magnet, hollow magnetic core and double winding moving-coil.

2, the described hand-free double-directional loudspeaker for receiver of small telephone of claim 1 is characterized in that vibrating membrane fixed support double as outer magnetic pole.

3, the described hand-free double-directional loudspeaker for receiver of small telephone of claim 1 is characterized in that the inside and outside single placement double winding moving-coil of using or also use of hollow magnetic core.

4, the described hand-free double-directional loudspeaker for receiver of small telephone of claim 1 is characterized in that the double winding moving-coil is double-wire spaced, separate.

5, the described hand-free double-directional loudspeaker for receiver of small telephone of claim 1 is characterized in that the double winding moving-coil is divided into outer three of interior, neutralization.

6, the described double winding moving-coil of claim 5, type double winding moving coil winding is fixed on the moving-coil inwall in it is characterized in that, in, external form double winding moving coil winding is for fixing a single layer winding respectively on the inside and outside wall of moving-coil.

7, the described interior type double winding moving-coil of claim 6 is characterized in that backplane level is arranged.

8, a kind of hand-free double-directional loudspeaker for receiver of small telephone power amplifier and control circuit are imported control switch, are electrically connected in proper order every direct sum audio frequency output capacitor, diode, power tube, power tube collector resistor, power tube emitter resistor, power tube base resistor, audio signal input control switch and audio signal input capacitor and form by loudspeaker audio.

9, described hand-free double-directional loudspeaker for receiver of small telephone power amplifier of claim 8 and control circuit is characterized in that power tube is positive-negative-positive or NPN type.

10, described hand-free double-directional loudspeaker for receiver of small telephone power amplifier of claim 8 and control circuit is characterized in that diode is silicon or germanium diode.