CN1805614B - Dual magnet headphone and hands-free loudspeaker for mobile audio devices - Google Patents

Abstract

The invention relates to a dual-magnetic telephone hand-free dual-function 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 an 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

The hands-free dual-purpose loud speaker of double magnetotype headphones for IVR equipment

Because of the convenience of telephone set hand-free function, the telephone set of the manufacturer of production and marketing at present production and marketing is all with hand-free function substantially, simultaneously, be receiver for the difference needs such as maintain secrecy must retain sounding components and parts again.Traditional hand-free function is mainly to realize with corresponding power driving amplifier by installing sounding components and parts loud speaker additional, this has just inevitably increased loud speaker and weight thereof and its shared area and volume, equally also inevitably make machine volume, 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) increase corresponding to difficulty design and manufacture cost, especially in the face of more and more miniaturization, ultrathin, the development of ultralightization and consumer market demand general trend, more demonstrate the most important property such as its market competitiveness height.Receiver is all generally 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 with line, carefully make the D.C. resistance of its coil very large because impedance is high, add and make power output very low because of high impedance, these factors are added together and make its power consumption and heating also just inevitable equally very large, therefore its energy utilization efficiency is very low, especially for being widely used, the mobile phone that quantity is extremely huge and other audio communication equipment, energy utilization efficiency is low just to be meaned to strengthen and transmits and receives power, this just inevitably increases amount of electromagnetic radiation, the electromagnetic radiation intensity larger to harm particularly, there is a kind of ear for what is called (plug) machine wide-spread and that use to replace the receiver of nearly body to reach to reduce IVR equipment and comprise that mobile phone is amount of radiation and intensity and the extent of injury to human body thereof of mobile phone, actually this is not so, this way only can be strengthened but not weaken the electromagnetic pollution of 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 and the machine between distributed capacitance (amount) between formed mutually one and/or a plurality of new the electromagnetic wave repeat transmitted and the receiver that are equivalent to resistance-capacitance coupling and induction type, now earphone and on line thereof have been served as the antenna of strengthening propagating electromagnetic radiation, and more much longer than airborne antenna, the scope of laying is also much wide, scope and the intensity of electromagnetic radiation have just been strengthened in the stack of these factors greatly, harm nature is just wider more greatly than nearly body earphone, also has a kind of same wide-spread and use, than increasing earphone, be exactly even to increase so-called radiation-proof film to reach the electromagnetic radiation and harm object that weakens the audio communication equipment such as mobile phone widely, this is also a kind of real erroneous tendancy that can realize that is difficult in fact, because detecting, much authority fact proved that most so-called radiation-proof films or other so-called diaphragm substantially do not possess radiation protection ability, can not alleviate any radiation and energy thereof seldom even at all, furtherly, even if very can effectively alleviate radiation and harm, also take to sacrifice and transmit and receive signal strength signal intensity as cost, because can alleviate the means of radiation intensity, it is mainly nothing but shielding electromagnetic wave, this just must cause strengthening, and to transmit and receive power be that cost is offset diaphragm to shielding electromagnetic waves, can't help more consuming energy, and because of the increase of amount of electromagnetic radiation and intensity, also can increase to positive correlation the amount of electromagnetic radiation of human body and intensity be the extent of injury, also the increase because of power is significantly shortened battery life, the time of using after each charging also significantly shortens, even if reduce and launch with received power to reduce electromagnetic hazard and pollution and battery consumption with raising 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, the fault of intermittently even conversing waits functional reliability and other performance is greatly reduced as repeatedly broken, solution remain add high-power, so its harmful consequences is basic identical, and these factors also all can have a strong impact on product market competition ability and serious increasing because of battery scrapped and accelerate to wait the environmental pollution that produces and the increase of use cost (battery of mobile phone is generally strongly fragrant more expensive, at least tens of even up to a hundred yuans), therefore increase loud speaker, answer electromagnetic radiation and the harm that can effectively reduce and surrounding enviroment next to the skin to human body because of the remote-wireless that can say with respect to receiver, but have aforesaid such as increasing the not enough problems such as components and parts and volume thereof, area, weight, cost.Obviously, if the innovation sounding components and parts that the low radiation hazard of the confidentiality of receiver and loud speaker is combined and be equipped with innovation can (easily) control drive power amplifier, it can not only effectively overcome the serial shortcoming of above-mentioned prior art and product, and its serial main advantages is that the advantages such as the market share are all apparent all will finally be embodied in the market competitiveness especially.

Total be exactly the hands-free dual-purpose loud speaker of double magnetotype headphones for IVR equipment for the goal of the invention of that the present invention be to solve that the series of problems of prior art and product designs.Now by the principle of its foundation, technical scheme and major advantage continues to introduce as after.The present invention directly utilizes receiver and the position being had thereof, volume, area, weight with it, and get rid of and determine circle and vibrating diaphragm and iron core, change that vibrating diaphragm with direct sounding is integrated but wire circle is seldom moving-coil and strong magnetic permanent-magnet alloy replaces respectively, to change receiver, by the superfine number of turns of wire diameter is a lot of, resistance is 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, the thrust that by the iron core after magnetization, are produced again operation principle and pattern, because moving-coil space is large and the little tonequality of integrated distortion is more true to nature and sensitivity is higher, the number of turns few and easily increase wire diameter thus resistance energy consumption and heating less, but it can bear and export very large audio power, not only solved receiver and determined circle little such as power, energy consumption is high, the easy distortion of sound especially sound when large because of the even hoarse unpleasant to hear all difficult problems such as serious noise of the extremely limited serious distortion causing of vibrating membrane space, also because superpower magnetic and the same powerful magnetic reserve capability that adopts strong magnetic permanent-magnet alloy and have only needs seldom magnetic material just can obtain powerful permanent magnetic, make product of the present invention extremely easily do very littlely, very light, very thin but its tonequality, power and sensitivity are but very excellent, thereby solved 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 again controlled easily (convenience) control power driving circuit, just satisfactorily realized the present invention and the goal of the invention thereof for a total inventive concept comprehensively.

Accompanying drawing and operation principle and advantage explanation:

Contrast accompanying drawing: Y is loud speaker; V is the magnet of Y; Q ₁and Q ₂for three moving (sound) independent of each other circles of Y, wherein: Q ₁for interior type moving-coil (is called for short inner ring, Q ₂similar abbreviation), B is for reinforcing Q ₁and specially designed backplane level, Q ₂for outer ring; X is Q ₁and Q ₂hollow magnetic pole; Z is that the vibrating membrane of Y is sounding body; P is that the fixed support of Z is also used as outer magnetic pole; D is diode; J is power tube, the base stage that the output that c is J (current collection) utmost point, b are J, the emitter that e is J; K ₁for audio signal input control switch, K _{1 '}, K _{1 "}be respectively K ₁one 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; 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 ₂power supply and loading resistor for c; R ₃resistor for the path of e and the working point of stable J.

C ₂one end and K ₂-K ₅one end be electrically connected to, C ₂the other end and negative pole and c and the R of D ₂one end be electrically connected to, K ₂-K ₅the other end be electrically connected to respectively with own corresponding F-I end, each end of F '-I ' is direct with power supply-it is ground connection that (bearing) utmost point is electrically connected to, the positive pole of D and K ₁one end K _{1 '}be electrically connected to K ₁other end K _{1 "}be electrically connected to b, K ₁with R ₁and C ₁one end be electrically connected to, R ₁and R ₂the other end and power supply+be extremely electrically connected to C ₁the other end be electrically connected to (omission), R with the machine audio-source output ₃one end and e be electrically connected to, R ₃other end ground connection.

Contrast accompanying drawing is further introduced structure, function and innovation advantage: loudspeaker Y is because adopting 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 in and outer two-stage magnetic pole and for hollow type can select arbitrarily in or beyond core layer and corresponding space thereof as laying moving-coil Q ₁and Q ₂and activity space, especially can be beneficial to volume and regulate and control with tonequality because put difference that two voice coil loudspeaker voice coils utilize for twice permanent magnetic to improve power output and two voice coil loudspeaker voice coils and the correspondence position on vibrating membrane thereof simultaneously when dual-purpose, in also can further utilizing, the inner space of external form moving-coil is all produced on two windings of interior type moving-coil on the inwall of moving-coil and by external form moving-coil interior, (design also has other advantage of series to winding of each cloth on outer wall simultaneously like this, see below), this makes loudspeaker miniaturization more with regard to having saved again moving-coil and movable a lot of spaces that should separately account for thereof, moreover, moving coil winding of the present invention be coil change traditional single line list around single group series connection for double-wire spaced pair of group and can be alone again can serial or parallel connection etc. the independent winding of multiple usage and purposes be absolute coil, make every group of coil in, external diameter and weight with effectively (produce and cutting magnetic line) line length with exert oneself size and the uniformity and resistance (comprising D.C. resistance and AC impedance) etc. with volume and increase power output and reduce that distortion improves the closely-related serial important indicator of tonequality (seeing below) and data are all accomplished highly consistent simultaneously, and these significant drawback of traditional voice coil loudspeaker voice coil and too far behind to catch up just, as the D.C. resistance of its single coil and energy consumption thereof, (D.C. resistance reduces power output and generates heat because of direct power consumption, the thing of even burning voice coil loudspeaker voice coil also happens occasionally, not rare, AC resistance is that impedance is not generally consumed energy and also do not generated heat comparatively speaking) be only 1/2 of tradition series connection voice coil loudspeaker voice coil, in the time only needing small volume, be under receiver or hands-free state, all can only appoint one group of voice coil loudspeaker voice coil to reduce volume and economize on electricity to extend service time of battery and life-span, in the time of the larger volume of needs, voice coil loudspeaker voice coil D.C. resistance in parallel is only 1/4 of tradition series connection voice coil loudspeaker voice coil, these are because the number of turns of each of two absolute coils and D.C. resistance are only 1/2 of its series coil, simultaneously again because parallel connection is equivalent to strengthen one times of wire diameter, its D.C. resistance is reduced by half again, in the time of needs utmost point amount of bass, also can connect, its adaptability as can be seen here, applicability and bag (holding concurrently) capacitive is very wide very strong, advantage is really more also important, because these are the major function of most audio communication instruments and the place of use value just, the 4th, not only make coil diameter increasing and direction also outside because expanding, Magnetic Core Design is become to hollow magnetic core and moving-coil is designed to inner ring and corresponding internal layer winding thereof, unless particularly inner ring of the present invention because of the probability that coil is attached on speech coil framework inwall, can is difficult to occur with the serious this possibility of degree being all worn through to outer wall of magnetic core friction by the protective effect of the voice coil loudspeaker voice coil outer wall without winding be very littleAlso be in addition backplane level B that an about 0.1-1mm can Bao Kehou in voice coil loudspeaker voice coil bottom to strengthen support force, in adding that the direct firmly splicing of voice coil loudspeaker voice coil top and vibrating membrane is even incited somebody to action, directly being made of one and strong resistance to deformation of external form voice coil loudspeaker voice coil and vibrating membrane, these are also the important distinct advantages of series that the present invention just may have, therefore can effectively prevent that the real core magnetic core of magnetic seam loudspeaker that the double-deck magnetic pole of common tradition forms is because of moving-coil coil long-term motion and heating or the dilatancy and make double-deck magnetic pole produce displacement as glue is loosening as screw nail or binding agent because of the fastener of collision or fixing double-deck magnetic pole of making moist, make the friction of coil and magnetic core and the little distortion of sound and when coil covering (because of enamel-covered wire enamelled coating very thin and be subject to thermal softening or sex change as adhesive force declines even break wait very easily very fast) by magnetic core worn-off after the powerful noise of generation] or dual-purpose space operation formula, distortion and displacement and adverse consequences thereof are not only effectively prevented, weight and/or volume are also effectively alleviated, and efficient (especially inside and outside dual-purpose formula can twice utilization change permanent magnetic into sounding power) have utilized inner magnet field force and density of line of magnetic force far above outside, magnetic induction intensity is also far above outside magnetic signature, even just making moving-coil only pass to light current, this only can produce weak alternating magnetic field and magnetic force, but it is in the powerful constant permanent magnetic interaction with permanent magnet generation, (homo-polarity magnetic repels each other, the coupling of heteropolarity magnetic force) time, also can produce same powerful suction to it because of powerful permanent magnetic, repulsion and enlarged markedly the active force of (being equal to amplification), thereby strengthen the movable energy of moving-coil, the energy that its vibrating membrane that promotes to be bonded as one is with it sounding body Z is also grown simultaneously, that is less alternating magnetic field (power) can be by means of stronger permanent magnetic, only need promote voice coil loudspeaker voice coil and the moving kinetic energy of vibrating membrane fortune (shaking) and further be converted into therefrom to promote air to transport (shaking) moving kinetic energy be the acoustic energy of sounding to consume portion of energy that less sounding power just can also convert the strength of part permanent magnetic to the required consumption of sounding easily as cost, thereby available less input power also can obtain larger volume, that is increase the power output of moving-coil, that is to say that less alternation magnetic force can be amplified by stronger permanent magnetic, obtain and can make further frivolous small-sized and high-quality of loudspeaker of the present invention and power driving circuit thereof and corresponding components and parts compared with large power output compared with little input power therefore available, consume electric energy and caloric value according to law of conservation of energy principle also because the increase of power output is less, thereby significantly reduce and receive, send out power and caloric value and battery and power consumption 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 transmitting and received power all can two-wayly reduce, mean be no matter quantity and the transmitting power of cell site and transmitter thereof or receiving equipment with it the transmitting-receiving power of corresponding IVR receiving equipment can two-wayly reduce, the winding of centre circle and outer ring is made inside and outside each single layer coil, and not only reinforce voice coil loudspeaker voice coil the same as interior type moving-coil to be to reduce the distortion of voice coil loudspeaker voice coil, also because of interior,Outer coil is in voice coil loudspeaker voice coil, fastening and the adhesive force direction of outer wall is just in time cancelled each other mutually on the contrary, and in being divided into because of coil in the time of voice coil loudspeaker voice coil energising work, outer individual layer, every layer of heat production few (only for double-deck 1/2) and because of the rapid heat dissipation that is multiplied of heat radiation (internal layer adds skin) area, therefore good heat dissipation effect, in addition, because of the direction of its inner coil and outer ring expanded by heating consistent outwards, therefore inner ring expands, required space can provide with the gap that outer ring expansion expands just, and in the time that voice coil loudspeaker voice coil power-off quits work with heat production, in it, the direction of the cooling contraction of exterior loop is also unanimously all inside, just can be used for outer ring and shrink needed inner space therefore inner ring shrinks the space of vacateing, these factors have all ensured in voice coil loudspeaker voice coil, outside coefficient of thermal expansion and contraction is consistent with degree height, in other words simultaneously and accomplished in high quality that heating is few comprehensively, rapid heat dissipation, not modification, this serial advantage is also that tradition is that export-oriented double-deck voice coil loudspeaker voice coil is not available, as the distortion of voice coil loudspeaker voice coil, even winding loose come off so that burn majority be mainly all because of the heating of double-layer overlapping winding fast, heat radiation is slow, due to 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 of loudspeaker Y and voice coil loudspeaker voice coil Q makes with magnet with wide and parallel, and because of its with magnet with wide and parallel, again that using with magnet is that permanent-magnet material that hollow magnetic core is identical is made and with the powerful permanent magnetic force of tool, therefore be also used as outer magnetic pole invigoration effect in permanent magnetic and effect of moving-coil, and be that inner ring and/or outer ring especially the magnetic force strengthening effect of outer ring all extremely significantly and are further made to the frivolous miniaturization of loudspeaker, thereby make the overall volume of loudspeaker and weight reduce to bottom line, these favorable factors all further reduce the volume of the mobile phone of the especially extensive production and marketing use of complete machine more effectively, weight, caloric value and energy resource consumption and environmental pollution and use cost, as the receipts of extending battery life and minimizing cell site's quantity and (transmitting power) scale and transmitting and receiving equipment, send out the environmental pollution such as the electromagnetic hazard to human body and refuse battery quantity that power etc. causes, and reduce battery power consumption and extend battery stand-by time with improve the market competitiveness (frivolous miniaturization is fundamental mark, and lower calorific value is frivolous small-sized basic prerequisite) etc. serial significant advantage, diode D act as when use make when handset function audio signal that energy is less utilize its forward conduction characteristic with direct input loudspeaker, make it only can send faint sound only to need small volume feature to be applicable to receiver, now loudspeaker replaces and serves as receiver and use and bring into play the corresponding function of receiver, and no matter loudspeaker be do receiver or hands-free with time diode D can automatically utilize again self very big anti-phase resistance to block power amplifier tube J output (current collection) utmost point c and power supply and load resistance R ₂direct current reverse pumping to K switch ₁', also just having avoided prime audio signal source is C ₁and line because of with K ₁Even ' induction too near and that easily cause in the time that loudspeaker is done hands-free use and through power tube repeatedly the distortion whistle of reflex after amplifying etc. interference, but loudspeaker in the time of receiver state because base stage b is without bias current, not conducting of J, its c utmost point and R ₂There is direct current pressure drop though upper but no current and power or direction change, produce without alternating signal, therefore also without C ₁Induction problem is noiseless, the positive terminal of D with every straight (stream power supply) capacitor C ₂One end electrical connection, its negative pole end and audio signal input control K switch ₁One end K _{1 '}Electrical connection, so that the input channel of the speaker frequency power under receiver state to be provided; C ₂Can isolate R simultaneously ₁And R ₂All not identical direct current pressure drop and 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 " demagnetization " or destroy loudspeaker and comprise the performance such as tonequality and volume, K of the magnetic that weakens loudspeaker permanent-magnet material ₂-K ₅Effect be further to regulate and control tonequality, volume or quiet, because of regulation and control also regulated and controled when volume vibrating membrane vibration position, intensity and amplitude Effective Regulation tonequality: when each key all volume maximum when closure, while all opening be quiet, the rest may be inferred, so just can regulate and control tonequality, volume by the traditional approach of conventional reduction input audio signal intensity, improve tonequality thereby reduce noise raising signal to noise ratio; K ₂-K ₅Also can to adopt variable resistor be potentiometer is regulated to gradual change type and regulates and controls continuously to become the transition formula volume tonequality of switch, 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; C ₂Another effect be regulation and control tonequality, by regulate C ₂Capacitance size control the frequency high low range of the tone currents passing through, due to C ₂In in the time that loudspeaker doubles as receiver use, be also C ₁Tone currents provide path,Be the total path including power amplifier output audio electric current, its capacitance because of consider the electric current that passes through compared with large value generally compared with C ₁For greatly, again because of C ₂With C ₁What form is series capacitance circuit and cut down C2 part capacitance, add at C ₁And C ₂Middle D in addition 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 be easy to by suitable adjustment C ₂(actual measurement is about C ₁The 3-10 of capacity is doubly) capacity just can the compatible C of fine realization ₁Frequency characteristic is overall tonequality balance; Pass through K ₁Connecting and disconnecting R ₁Be electrically connected to change the permanent fixing electrical connection pattern of traditional bias current with the bias current of b, therefore not only can ensure aforesaid when with receiver 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 time provide power tube bias current to reduce distortion to improve tonequality, the stable operating point of e by series connection with it and doublely do little resistance (being generally the about 0.5-1 Europe) resistance R that protector is used 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, so loud speaker Y is because adopting permanent magnetism ferromagnetic material its magnet V and magnetic core X all to do to such an extent that very thin, general 0.2-0.5cm even more (surpass) thin 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 magnetic pole place, moving-coil wall is to keep 0.1-0.2mm to be intermittently advisable with magnet core wall, because only have 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 flushes with magnetic core the top plane substantially with facial planes in 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 maximal audio power output is max volume, the shape of vibrating membrane can be matrix, convex, plane, round, square type or other any shape or its combined shaped all can, 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 with power, be greater than the silicon of any type of 0.1W, the withstand voltage 6V of being greater than or germanium diode all can, the present embodiment adopts good and cheap and the most widely used 1N4004 and 1N4007 etc., power tube J with power, be greater than the PNP of any type of 0.3W, the withstand voltage 20V of being greater than or NPN pipe all can, accompanying drawing adopts 0.5-1W, withstand voltage 25-50VNPN type, as adopted positive-negative-positive power supply polarity contrary with NPN type, audio signal input control K switch ₁with the two group switches of the miniature hilted broadsword of any type as press-key lock fixed pattern, dial type, Electronic Control as touch or press-type etc. all can, 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 ₅also by miniature press-key lock fixed pattern but use hilted broadsword single-plicate instead, capacitor C ₁with capacity, be greater than the non-polar condenser of 0.1 μ F, withstand voltage 6-10 volt, the present embodiment adopts 0.3 μ F6.3 volt, capacitor C ₂nonpolarity or the electrolytic capacitor that is greater than 1 μ F with capacity all can, the present embodiment adopts 10 μ F10 volt electrolytic capacitors, 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 can not be in advance in concrete modes such as embodiment and stipulate its occurrence, therefore statement reference value R ₁200 Europe-20K and R ₂20 Europe-2K use only for reference, but these those skilled in the art that at all do not affect 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 to be also the most basic prerequisite general knowledge and to have equally a large amount of and conventional test and the detailed introduction of method of adjustment and reference book, product description etc. and record and belong to general knowledge together, as previously mentioned, because of R ₃function be mainly stable operating point and serve as insurance (resistance) thread, and the i.e. in most cases rarely large variation in normal operation of these functions, therefore 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 larger on the impact of the important parameter such as loud speaker and power tube power output and the latter's amplifying power, 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: because the present invention integrates receiver and loud speaker and function thereof and can freely switch and switch extremely convenient, can switch to arbitrarily at any time receiver or loud speaker mode and without dropped calls, single loud speaker 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 being beneficial to, correct so-called ear (plug) machine and alleviate radiation and the erroneous tendancies such as harm to user, because not only bothering inconvenience as aforementioned use earphone, and real in having increased radiation and harmfulness.

The present invention integrates above-mentioned serial main advantages, 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 (1)

1. an IVR equipment double magnetotype headphones hand-free loudspeaker, is characterized in that sharing vibrating membrane and inside and outside wall moving-coil, one end every direct sum audio frequency output capacitor C2 is electrically connected to one end of audio frequency input control K switch 2-K5, the other end every direct sum audio frequency output capacitor C2 is electrically connected to one end of loading resistor R2 with the power supply of the negative pole of diode D and the collector electrode c of power tube J and collector electrode c, audio frequency input control K switch 2, the other end of K3 respectively with two winding FF ' and GG' audio input end F of organizing of the coil M of moving-coil Q1 with own corresponding loud speaker Y, G is electrically connected to, two group winding FF ' of the coil M of the moving-coil Q1 of loud speaker Y and the audio output F ' of GG', G ' ground connection, audio frequency input control K switch 4, the other end of K5 respectively with two audio input end H that organize winding HH' and II ' of the coil N of moving-coil Q2 with own corresponding loud speaker Y, I is electrically connected to, two group winding HH ' of the coil N of the moving-coil Q2 of loud speaker Y and the audio output H ' of II ', I ' ground connection, the positive pole of diode D is electrically connected to one end K1 ' of audio signal input control K switch 1, the other end K1 of audio signal input control K switch 1 " be electrically connected to the base stage b of power tube J, the 3rd end of audio signal input control K switch 1 is electrically connected to one end of the resistor R1 of the base stage b of power tube J and audio frequency input capacitor C1, the power supply of the other end of the resistor R1 of the base stage b of power tube J and the collector electrode c of power tube J is electrically connected to the other end of loading resistor R2 and the positive terminal of power supply, the other end of audio frequency input capacitor C1 is electrically connected to the machine audio-source output, be communicated with power tube J emitter e path and play one end of resistor R3 and the electrical connection of the emitter e of power tube J of the working point effect of stablize power tube J, stablize the other end ground connection of resistor R3 of the working point of power tube J.