CN1805619B - Headphone and hands-free loudspeaker and its power amplifier and control circuit - Google Patents

Abstract

The invention relates to a hands-free telephone receiver which can be used as mike, and relative power amplifier and control circuit. The invention comprises a mike, an audio frequency control switch, a blocking audio frequency output capacitor, a diode, a power amplifier tube, a collecting electrode, an emitting electrode, a base electrode resistance, an audio signal input control switch, and a audio frequency signal input capacitor. The invention can be switched into telephone receiver or mike modes, with high sensitivity, high efficiency, high output power and beautiful timbre. The invention can be used in notebook computer and electric dictionary, etc.

Description

Headphone and hands-free loudspeaker and power amplifier thereof and control circuit

Because the telephone set of the convenience of telephone set hand-free function, at present production and marketing manufacturer production and marketing is all with hand-free function substantially, simultaneously, in order to maintain secrecy etc., different needs must retain sounding components and parts and receiver again.Traditional hand-free function is mainly by installing sounding components and parts loud speaker additional and corresponding power driving amplifier realizes, this inevitably increases loud speaker and weight thereof and the area shared by it and volume, also inevitably machine volume is made equally, weight, (fact proves with experience reliability all repeatedly: under the prerequisite that other condition is identical, failure rate often always becomes high-positive correlation to the number of component number) increase corresponding to difficulty design and manufacture cost, especially in the face of more and more miniaturized, ultrathin, the development of ultralightization and consumer market demand general trend, then more demonstrate the most important property such as its market competitiveness height.Receiver is generally all 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 make the D.C. resistance of its coil very large because the high line of impedance is thin, add because high impedance makes power output very low, these factors are added together and make it consume energy and generate heat also just inevitable equally very large, therefore its energy utilization efficiency is very low, especially for widely using, the mobile phone that quantity is extremely huge and other audio communication equipment, energy utilization efficiency low just meaning must strengthen transmitting and receiving power, this just inevitably increases amount of electromagnetic radiation, particularly larger to harm electromagnetic radiation intensity, a kind of what is called ear (plug) machine that is wide-spread and that use is had to replace the receiver of nearly body to reach reduction IVR equipment to comprise the amount of radiation of mobile phone and mobile phone and intensity and the extent of injury to human body thereof, actually this is not so, this way only can be strengthened but not the electromagnetic pollution weakened human body and surrounding enviroment and harm, because between the resistance of the electric wire of frames connecting with headphone and earphone voice coil loudspeaker voice coil winding and they, comprise to constitute mutually between the distributed capacitance (amount) between the machine one and/or multiple newly be equivalent to capacitance-resistance coupling and with the electromagnetic wave repeat transmitted of induction type and receiver, namely now earphone and on line thereof act as the antenna strengthening propagating electromagnetic radiation, and it is more much longer than airborne antenna, the scope of laying is also much wide, the superposition of these factors just strengthens scope and the intensity of electromagnetic radiation greatly, harm nature is just larger than nearly body earphone wider, also have one wide-spread equally and use, be exactly even the electromagnetic radiation and the harm object that increase so-called radiation-proof film to reach the audio communication equipment such as weakening mobile phone widely than increase earphone, this is also a kind of erroneous tendancy being difficult to really to realize in fact, because much authority detects fact proved that most so-called radiation-proof film or other so-called diaphragm do not possess radiation protection ability substantially, seldom can not alleviate any radiation and energy thereof even at all, even so, even if very can effectively alleviate radiation and harm, also to sacrifice transmitting and receiving signal strength signal intensity for cost, because the means that can alleviate radiation intensity mainly shield electromagnetic wave nothing but, this just must cause strengthening transmitting and receiving power for cost is to offset diaphragm to shielding electromagnetic waves, can't help more consuming energy, and also can increase to positive correlation the amount of electromagnetic radiation of human body and intensity and the extent of injury because of the increase of amount of electromagnetic radiation and intensity, also make battery life significantly shorten because of the increase of power, the time that each charging uses afterwards also significantly shortens, even if reduce launching and receiving power to reduce electromagnetic hazard and pollution and battery consumption to improve directivity (radio wave directivity is very strong), but this just makes wireless audio communication device orientation extremely strong, speech quality is as suddenly big or suddenly small in sound, smudgy, fault of intermittently even conversing such as broken string repeatedly etc. makes functional reliability and other performance greatly reduce, solution remain add high-power, so its harmful consequences is substantially identical, and these factors also all can have a strong impact on product market competition ability, and (battery of mobile phone is generally all more expensive with the increase seriously increasing environmental pollution and the use cost produced because quickening etc. scrapped by battery, at least tens of even up to a hundred yuans), increase loud speaker because can answer therefore electromagnetic radiation and the harm of and surrounding enviroment next to the skin to human body can be effectively reduced by the remote-wireless for receiver, but have and aforesaidly such as increase the not enough problem such as components and parts and volume, area, weight, cost.Obviously, if innovation sounding components and parts that the Low emissivity harmfulness of the confidentiality of receiver and loud speaker is combined and be equipped with innovation and (easily) control can drive power amplifier, then it effectively can not only overcome the number of disadvantages of above-mentioned prior art and product, and its serial main advantages is all apparent all finally will be embodied in the advantage such as the market competitiveness and the market share especially.

Total be exactly the present invention is for solving the series of problems of prior art and product and the Headphone and hands-free loudspeaker for the goal of the invention of that designs and power amplifier thereof and control circuit, existing principle, scheme and major advantage are continued introduce as after.The present invention directly utilizes receiver and the position had thereof, volume, area, weight with it, and get rid of determine circle and vibrating diaphragm and iron core, respectively change with the integration of the vibrating diaphragm of direct sounding but wire circle seldom namely moving-coil and strong magnetic permanent-magnet alloy replace, to change receiver, by the superfine number of turns of wire diameter is a lot of, resistance is comparatively large, power consumption and heat production all more determine circle first generate an electromagnetic field and magnetize iron core, the indirect sounding of vibrating diaphragm is inhaled, put to the suction produced by the iron core after magnetizing again, thrust operation principle and pattern, because moving-coil space is large and integrated distortion is little and the more true to nature and sensitivity of tonequality is higher, the number of turns is few and easily increase wire diameter event resistance energy consumption and generate heat less, but it can bear and export very large audio power, not only solve receiver and surely enclose such as power little, energy consumption is high, all difficult problems such as the even hoarse unpleasant to hear serious noise of serious distortion that the easy distortion of sound causes because vibrating membrane space is extremely limited when especially sound is larger, also only need little magnetic material just can obtain powerful permanent magnetic because adopting strong magnetic permanent-magnet alloy and the super magnetic had and magnetic reserve capability powerful equally thereof, product of the present invention is made can extremely easily to do very little, very light, very thin but its tonequality, power and sensitivity are but very excellent, thus solve urgently to be resolved hurrily small-sized of existing product, ultra-thin, ultralight, high-power and high tone quality, the serial difficult problem such as high sensitivity, be equipped with controlled easily (convenience) control power driving circuit again, just satisfactorily achieve the present invention for a total inventive concept and goal of the invention thereof comprehensively.

Accompanying drawing and operation principle and advantage illustrate:

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

C ₂one end and K ₂-K ₇one end electrical connection, C ₂the other end and the negative pole of D and c and R ₂one end electrical connection, K ₂-K ₇the other end respectively with hold with oneself corresponding F-L be electrically connected, F '-L ' respectively hold directly with power supply-it is ground connection that (bearing) pole is electrically connected, the positive pole of D and K ₁one end K _{1 '}electrical connection, K ₁other end K _{1 "}be electrically connected with b, K ₁with R ₁and C ₁one end electrical connection, R ₁and R ₂the other end and power supply+be extremely electrically connected, C ₁the other end be electrically connected (omission) with the machine audio-source output, R ₃one end and e electrical connection, R ₃other end ground connection.

Comparison accompanying drawing introduces structure, function and innovation advantage further: loudspeaker Y is because adopting permanent magnetism ferromagnetic material, so its magnet V does very thin, magnetic core X also makes hollow type, this just significantly reduces weight and volume, in addition, because of magnetic core is multistage and for hollow type thus can select arbitrarily interior, in or the space of outer core layer and correspondence thereof as laying moving-coil Q ₁, Q ₂and Q ₃and activity space, especially permanent magnetic can be utilized for three times during dual-purpose to improve the difference of power output and three voice coil loudspeaker voice coils and the correspondence position on vibrating membrane thereof and be beneficial to volume and tonequality regulation and control because putting three voice coil loudspeaker voice coils simultaneously, in also can utilizing further, the inner space of external form moving-coil two windings of inner mold moving-coil are all produced on the inwall of moving-coil and will in, external form moving-coil is interior, on outer wall, (design also has other advantage of series to each cloth winding simultaneously like this, see below), this just eliminates again moving-coil and activity should separately account for a lot of space and make loudspeaker more miniaturized, moreover, it is double-wire spaced pair of group and can be alone but also can the independent winding of the multiple usage such as serial or parallel connection and purposes and absolute coil that moving coil winding of the present invention i.e. coil changes tradition single line list around single group series connection, make often to organize in coil, external diameter and weight are with effectively (namely producing and cutting magnetic line) line length and exert oneself size and the uniformity and resistance (comprising D.C. resistance and AC impedance) etc. and volume and increase power output and reduce distortion and namely improve tonequality (seeing below) closely-related series important indicator and data are accomplished highly consistent all simultaneously, and these significant drawback of traditional voice coil and too far behind to catch up just, (D.C. resistance reduces power output because directly consuming energy and generates heat for the D.C. resistance of coil as single in it and energy consumption thereof, the thing even burning voice coil loudspeaker voice coil also happens occasionally, not rare, AC resistance and impedance are not generally consumed energy and are not generated heat yet comparatively speaking) it is only the 1/2 of conventional serial voice coil loudspeaker voice coil, when only needing it is all can only appoint one group of voice coil loudspeaker voice coil under receiver or hands-free state to reduce volume and to economize on electricity to extend service time of battery and life-span during small volume, when needing bigger volume, voice coil loudspeaker voice coil D.C. resistance in parallel is only the 1/4 of conventional serial voice coil loudspeaker voice coil, these are because the number of turns of each of two absolute coils and D.C. resistance are only the 1/2 of its series coil, be equivalent to because of parallel connection again increase one times of wire diameter simultaneously, its D.C. resistance is reduced by half again, also can connect when needs pole amount of bass, its adaptability as can be seen here, applicability and bag (holding concurrently) capacitive are very wide very strong, advantage is really more also important, because these are most major function of audio communication instrument and the place of use value just, 4th, not only make coil diameter increasing and direction also outside because expanding, Magnetic Core Design is become hollow core become with by moving coil design inner ring and corresponding internal layer winding, particularly inner ring of the present invention because of coil be attached on speech coil framework inwall, can be difficult to by the protective effect of the voice coil loudspeaker voice coil outer wall without winding and magnetic core rub unless rub serious be all worn through to outer wall degree,And the probability that namely this possibility occurs is very little, also be bottom voice coil loudspeaker voice coil in addition an about 0.1-1mm can the backplane level B of Bao Kehou to strengthen support force, add voice coil loudspeaker voice coil top and vibrating membrane directly firmly glued joint even will in, external form voice coil loudspeaker voice coil and vibrating membrane directly being made of one and strong resistance to deformation, these are also the serial important particular advantages that the present invention just may have, therefore the real core magnetic core loudspeaker of the magnetic seam that can effectively prevent common conventional double magnetic pole to form because of moving-coil coil long-term motion and heating or makes moist dilatancy and fastener such as screw nail or binding agent because of collision or fixing double-deck magnetic pole make double-deck magnetic pole produce displacement as glue loosens, make coil and magnetic core friction and the powerful noise of the little distortion of sound and generation after coil covering (because of enamel-covered wire enamelled coating very thin and even break etc. and very easily very fast by thermal softening or sex change such as adhesive force decline) is galled by magnetic core] or dual-purpose space operation formula, not only effectively prevent distortion and displacement and adverse consequences thereof, also effectively alleviate weight and/or volume, and efficient (especially inside and outside dual-purpose formula can twice utilization change permanent magnetic into sounding power) make use of inner magnet field force and density of line of magnetic force far above outside, magnetic induction intensity is also far above the magnetic signature of outside, even this just makes moving-coil only pass to light current and only can produce more weak alternating magnetic field and magnetic force, but it interacts at the powerful constant permanent magnetic produced with permanent magnet, and (homo-polarity magnetic repels each other, heteropolarity magnetic force coupling) time, also because of powerful permanent magnetic, it can be produced suction powerful equally, repulsion and enlarged markedly the active force of (being equal to amplification), thus increase the movable energy of moving-coil, it is made to promote the energy of the vibrating membrane being bonded as one with it and sounding body Z also to grow simultaneously, that is less alternating magnetic field (power) can by means of stronger permanent magnetic, only just easily the strength of part permanent magnetic can need to also be converted the kinetic energy that namely portion of energy consumed needed for sounding promotes voice coil loudspeaker voice coil and vibrating membrane fortune (shaking) to move to and the acoustic energy being converted into kinetic energy and the sounding promoting air fortune (shaking) dynamic therefrom further to consume less sounding power as cost, thus available less input power also can obtain bigger volume, that is add the power output of moving-coil, that is less alternate magnetic force can be amplified by stronger permanent magnetic, therefore available less input power obtains bigger power output and can make the further frivolous small-sized and high-quality of loudspeaker of the present invention and power driving circuit and corresponding components and parts thereof, the electric energy and the caloric value that consume are also less because of the increase of power output according to law of conservation of energy principle, thus significantly reduce receipts, send out power and caloric value and battery and power consumption thereof and environmental pollution and use cost, as because only needing less sounding input power, just make only to need very little audio input signal just can reach call object, be equivalent to improve machine sensitivity and speech quality as reduced correspondent tropism and broken string etc., this just can make launching and receiving power all can two-way reduce, mean it is no matter that the transmitting-receiving power of the quantity of cell site and transmitter thereof the IVR receiving equipment namely corresponding with it with transmitting power or receiving equipment can two-way reduce, the winding of centre circle and outer ring makes inside and outside each single layer coil,Not only reinforce voice coil loudspeaker voice coil the same as inner mold moving-coil is to reduce the distortion of voice coil loudspeaker voice coil, also because of in, outer coil is in voice coil loudspeaker voice coil, fastening and the adhesive force direction contrast of outer wall and cancel each other, and when voice coil loudspeaker voice coil energising work because of in coil is divided into, outer individual layer, every layer of heat production few (being only double-deck 1/2) and because heat radiation (internal layer adds skin) being multiplied of area rapid heat dissipation, therefore good heat dissipation effect, in addition, because its inner coil is consistent with the direction of outer ring expanded by heating namely outwards, therefore can expand with outer ring just in the space needed for inner ring expansion, the gap expanded provide, and when voice coil loudspeaker voice coil power-off quits work with heat production, in it, the direction of exterior loop cooling meat is also consistent namely all inside, therefore the space that inner ring contraction is vacateed can be used for the inner space required for outer ring is shunk just, these factors have all ensured in voice coil loudspeaker voice coil, outside coefficient of thermal expansion and contraction is consistent with degree height, accomplished that heating is few in high quality in other words simultaneously and comprehensively, rapid heat dissipation, not modification, this number of advantages is also that tradition is namely not available for export-oriented double-deck voice coil loudspeaker voice coil, such as the distortion of voice coil loudspeaker voice coil, even winding loose comes off and even to burn most all mainly heating because of double-layer overlapping winding fast, heat radiation is slow, caused by voice coil loudspeaker voice coil and winding and each other coefficient of thermal expansion and contraction and unbalance stress, fixing (holder) frame P of the vibrating membrane Z and voice coil loudspeaker voice coil Q of loudspeaker Y makes wide together and parallel with magnet, and because itself and magnet are with wide and parallel, be again make with the permanent-magnet material identical with magnet and hollow core and with the powerful permanent magnetic force of tool, therefore be also used as outer magnetic pole and invigoration effect in the permanent magnetic of moving-coil and effect, and be that the magnetic force strengthening effect to inner ring and/or outer ring especially outer ring all extremely significantly and further makes the frivolous miniaturization of loudspeaker, thus make the overall volume of loudspeaker and weight reduce to bottom line, these favorable factors reduce the volume of the mobile phone that the especially extensive production and marketing of complete machine uses all further more effectively, weight, caloric value and energy resource consumption and environmental pollution and use cost, such as the receipts of extending battery life and minimizing cell site's quantity and (transmitting power) scale and launching and receiving equipment, send out the environmental pollutions such as the electromagnetic hazard to human body that power etc. causes and refuse battery quantity, and reduce battery power consumption and extend battery standby time with improve the market competitiveness (frivolous miniaturization is fundamental mark, and lower calorific value is frivolous small-sized basic prerequisite) etc. series significant advantage, diode D act as when using the audio signal making energy less during handset function to utilize its forward conduction characteristic with direct input loudspeaker, make it only can send faint sound only to need small volume feature with applicable receiver, now loudspeaker replaces and serves as receiver and use and the corresponding function that plays receiver, and when no matter loudspeaker does receiver or hands-free use, diode D can automatically utilize again self very big anti-phase resistance power amplifier tube J exports (current collection) pole c and power supply thereof and load resistance R to block ₂direct current reverse pumping to K switch ₁', also just avoid prime audio signal source and C ₁And line because of with K ₁Even ' too near and induction that is that easily cause when hands-free use done by loudspeaker and through power tube repeatedly reflex amplify after the distortion whistle cry to wait and disturb, but loudspeaker when receiver state because base stage b is without bias current, J not conducting, its c pole and R ₂Have direct current pressure drop though upper but no current and strong and weak or direction change, namely without alternating signal generation, therefore also without C ₁Induction problem and noiseless, the positive terminal of D is with every straight (stream power supply) capacitor C ₂One end electrical connection, its negative pole end and audio signal input gauge tap K ₁One end K _{1 '}Electrical connection, to provide the speaker frequency power input channel under receiver state; C ₂R can be isolated simultaneously ₁And R ₂Produce the direct current pressure drop all not identical with Properties and effect and DC current respectively, with avoid moving-coil also because of by these direct currents and produce permanent magnetic field force and resist and the side effect such as magnetic i.e. " demagnetization " that weakens loudspeaker permanent-magnet material reduces or destroys loudspeaker and comprises the performance such as tonequality and volume, K ₂-K ₇Effect be regulate and control tonequality, volume or quiet further, because also having regulated and controled the vibration position of vibrating membrane, intensity and amplitude and Effective Regulation tonequality while regulation and control volume: when each key all closes volume maximum, when all opening be quiet, the rest may be inferred, so just can regulate and control tonequality, volume by the traditional approach of the reduction input audio signal intensity of routine, thus reduce noise raising signal to noise ratio and namely improve tonequality; K ₂-K ₇Variable resistor and potentiometer also can be adopted to be regulated to gradual change type to become the transition formula volume tonequality of switch regulate and control continuously, and no matter be adopt switch or potentiometer regulation and control all more reliable, convenient and simple than complicated loaded down with trivial details perishable integrated chip computing circuit and regulation and control; C ₂Another effect be regulation and control tonequality, by regulate C ₂Capacitance size control the frequency high low range of the tone currents passed through, due to C ₂Also it is C while loudspeaker doubles as when receiver uses ₁Tone currents provide path, be namely the total path comprising power amplifier output audio electric current, its capacitance is because considering the electric current that passes through relatively big and the general relatively C of value ₁For greatly, again because of C ₂With C ₁Form being series capacitance circuit and reduce C2 part capacitance, add at C ₁And C ₂Middle also have D ₂The DC internal resistance in number Europe-tens of Europe is to from C ₁The attenuation of certain amplitude of tone currents of upper frequency, therefore easily via suitably adjusting C ₂(actual measurement is about C ₁The 3-10 of capacity is doubly) capacity just can realize compatibility C very well ₁Frequency characteristic and overall tonequality balance; Pass through K ₁Connecting and disconnecting R ₁With the bias current of b electrical connection to change the tradition permanent fixing electrical connection pattern of bias current, not only can ensure the aforesaid base stage of power tube when using the earpiece because of be cut off without bias current thus do not produce noise jamming receiver tonequality, also can ensure when loudspeaker replace receiver use time provide power tube bias current to reduce distortion to improve tonequality, e is by the stable operating point of series connection with it and double little resistance (being generally about 0.5-1 Europe) the resistance R doing protector ₃Ground connection, to form audio frequency alternating current circuit loop.

Embodiment and operation principle of the present invention remark additionally with advantage: contrast accompanying drawing, loud speaker Y is because adopting permanent magnetism ferromagnetic material so its magnet V and magnetic core X is all very thin, general 0.2-0.5cm even more (surpasses) thin namely enough, and magnetic core X makes hollow type and will move (sound) and encloses Q ₁and/or Q ₂unsettled the top and the magnetic pole place being placed in magnetic core, moving-coil wall is to keep 0.1-0.2mm interval to be advisable with magnet core wall, because only have the magnetic line of force at magnetic pole place the most concentrated, the most die magnetic force of density is the most powerful, the degree of depth of laying flushes with magnetic core the top plane substantially with voice coil loudspeaker voice coil winding middle plane, to ensure no matter voice coil loudspeaker voice coil moves up and down Shi Douke cutting magnetic line and produce maximum promotion vibrating membrane and to be synchronized with the movement the power namely vibrated to greatest extent, thus obtain maximal audio power output and max volume, the shape of vibrating membrane can be matrix, convex, plane, round, square type or other any shape or its combined shaped, the present embodiment is that further conserve space adopts plane, but this to be not the present invention can only adopt planar shaped (lower with), diode D power is greater than 0.1W, withstand voltage silicon or the germanium diode being greater than any type of 6V, and the present embodiment adopts good and cheap and the most widely used IN4004 and IN4007 etc., power tube J power is greater than 0.3W, withstand voltage PNP or the NPN pipe being greater than any type of 20V, and accompanying drawing adopts 0.5-1W, withstand voltage 25-50VNPN type, as adopted positive-negative-positive polarity of powering contrary with NPN type, audio signal input control K switch ₁with the two group switch of the miniature hilted broadsword of any type if press-key lock fixed pattern, dial type, Electronic Control are as touch or press-type etc., the 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 hilted broadsword single-plicate is used instead by miniature press-key lock fixed pattern, capacitor C ₁be greater than the non-polar condenser of 0.1 μ F, withstand voltage 6-10 volt with capacity, the present embodiment adopts 0.3 μ F6.3 to lie prostrate, capacitor C ₂be greater than the nonpolarity or electrolytic capacitor of 1 μ F with capacity, the present embodiment adopts 10 μ F10 to lie prostrate electrolytic capacitor, R ₁and R ₂resistance as wider with mains voltage variations in the difference at double of multiplication factor etc. with concrete power tube J and parameter, obviously also just in advance in the specifically mode specify its occurrence such as embodiment, therefore reference value R can not be stated ₁200 Europe-20K and R ₂20 Europe-2K use only for reference, but this at all the those skilled in the art do not affected described in Patent Law implement this patent, because after concrete power tube is selected, its product description or consult the reference books such as handbook and all can obtain every design parameter accurately, adjusting resistance value makes parameter reach optimum range also just the most basic prerequisite general knowledge and have the detailed introduction of a large amount of and conventional test and method of adjustment and reference book, product description etc. and record equally and belong to general knowledge together, as previously mentioned, because of R ₃function mainly stable operating point and serve as insurance (resistance) silk, and the namely in most cases rarely large in normal operation change of these functions, therefore its to accuracy and precise requirements not high, in most cases resistance is all very suitable in the interval in 0.5-2 Europe, and the important parameter impacts such as too low stability and safety effect is poor, the too high amplifying power on loud speaker and power tube power output and the latter are larger, 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 main advantages: integrate receiver and loud speaker and function thereof due to the present invention and freely can switch and switch extremely convenient, can be receiver or speaker mode and without the need to dropped calls by any switching laws at any time, single loud speaker doubles as receiver and ultra-thin, ultralight, subminaturization (can do also little also light also thin more a lot than receiver earphone) and high sensitivity, high effect and high-output power and tonequality graceful, the serial great innovation of the little grade of distortion and advantage, these advantages are for realizing and meeting the frivolous miniaturization of product, especially the needing at any time and to like and the crucial serviceability of many decision market shares such as unrestricted choice call and Music Appreciation mode and consumption demand aspect provide and greatly facilitate and competitiveness arbitrarily of the melodious grace of tonequality and consumer, correct so-called ear (plug) machine as being beneficial to and alleviate radiation and to erroneous tendancies such as the harm of user, because such as aforementioned use earphone not only bothers inconvenience, and it is real in adding radiation and harmfulness.

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

Claims (4)

1. a Headphone and hands-free loudspeaker, its feature is as follows: the inside and outside magnetic pole of tool; Vibrating membrane fixed support material is identical with magnet, makes with magnet with wide and parallelly double as outer magnetic pole; The independent spaced double winding of moving-coil tool, moving-coil and double winding thereof use inside and outside magnetic pole simultaneously, and moving-coil and double winding thereof connect in the same way, change the usage quantity of winding and the impedance of bind mode change winding and power and realize loudspeaker impedance and power conversion; The inside and outside wall of external form double winding moving-coil respectively has a single layer winding; Tool hollow core, its inner incorporeity magnetic core, space, for placing inner mold moving-coil, the inwall of inner mold moving-coil are attached with winding and backplane level is arranged at bottom; Share vibrating membrane and outer magnetic pole.

2. the power amplifier of Headphone and hands-free loudspeaker described in claim 1 and control circuit, its feature is as follows: every direct sum audio frequency output capacitor (C ₂) one end and audio frequency input control switch (K ₂), (K ₃) one end electrical connection, audio frequency output capacitor (C ₂) the other end and the negative pole of diode (D) and the collector electrode (c) of power tube (J) and the power supply of collector electrode (c) and loading resistor (R ₂) one end electrical connection, audio frequency input control switch (K ₂), (K ₃) the other end organizes the audio input end (F) of winding (FF ') and (GG ') respectively with the coil (M) of the moving-coil (Q) with oneself corresponding loud speaker (Y) two, (G) be electrically connected, the audio output of two group windings of the coil (M) of the moving-coil (Q) of loud speaker (Y) (FF ') and (GG ') (F '), (G ') ground connection, the positive pole of diode (D) and audio signal input control switch (K ₁) one end (K ₁') electrical connection, audio signal input control switch (K ₁) the other end (K ₁") be electrically connected with the base stage (b) of power tube (J), audio signal input control switch (K ₁) with the resistor (R of the base stage (b) of power tube (J) ₁) and audio frequency input capacitor (C ₁) one end electrical connection, the resistor (R of the base stage (b) of power tube (J) ₁) and the power supply of collector electrode (c) of power tube (J) and loading resistor (R ₂) the other end be electrically connected with the positive terminal (+) of power supply, audio frequency input capacitor (C ₁) the other end be electrically connected with the machine audio-source output, emitter (e) electrical connection of one end of the resistor (R3) of the path of the emitter (e) of power tube (J) and the working point of stable power tube (J) and power tube (J), stablize the other end ground connection of the resistor (R3) of the working point of power tube (J).

3. the power amplifier of Headphone and hands-free loudspeaker described in claim 2 and control circuit, is characterized in that power tube is positive-negative-positive or NPN type.

4. the power amplifier of Headphone and hands-free loudspeaker described in claim 2 and control circuit, is characterized in that diode is silicon or germanium diode.

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